Feel free to copy and use however you like. If you find some shortcuts or enhancements that are general enough please share and I will add them.

/* FIELD INPUT LIMITERS (VALIDATORS) */
var validate = {};
/* ex. usage: document.getElementById('someinput').onkeypress = validate.dec; */
// decimal (negative and positive with 'unlimited' numbers above and below the dec point)
// - will limit the input from user to numbers and 1 decimal point and 1 negative sign in the correct position only.
validate.dec = function(e){
        var cur_return = false,
        cur_value, cur_full_value, cur_string;
        // validate float/dec
        cur_string = String.fromCharCode(e.charCode).toString();
        cur_value = e.target.value;
        cur_full_value = cur_value.substring(0, e.target.selectionStart) + cur_string + cur_value.substring(e.target.selectionStart);
        if (cur_string.match(/[0-9.\-]/) &&
            (!cur_string.match(/-/) || (cur_string.match(/-/) && !cur_value.match(/-/) && cur_full_value.substring(0, 1) === "-")) &&
            (!cur_string.match(/[.]/) || (cur_string.match(/[.]/) && !cur_value.match(/[.]/) && cur_full_value.substring(0, 1) !== ".")) &&
            cur_full_value.match(/-?(0|([1-9]\d*))(\.\d+)?/)) {
                cur_return = true;
        }
        return cur_return;
};

objArray = [
{_id : "GB", _html: "United Kingdom"},
{_id : "US", _html: "United States"},
{_id : "AF", _html: "Afghanistan"},
{_id : "AL", _html: "Albania"},
{_id : "DZ", _html: "Algeria"},
{_id : "AS", _html: "American Samoa"},
{_id : "AD", _html: "Andorra"},
{_id : "AO", _html: "Angola"},
{_id : "AI", _html: "Anguilla"},
{_id : "AQ", _html: "Antarctica"},
{_id : "AG", _html: "Antigua And Barbuda"},
{_id : "AR", _html: "Argentina"},
{_id : "AM", _html: "Armenia"},
{_id : "AW", _html: "Aruba"},
{_id : "AU", _html: "Australia"},
{_id : "AT", _html: "Austria"},
{_id : "AZ", _html: "Azerbaijan"},
{_id : "BS", _html: "Bahamas"},
{_id : "BH", _html: "Bahrain"},
{_id : "BD", _html: "Bangladesh"},
{_id : "BB", _html: "Barbados"},
{_id : "BY", _html: "Belarus"},
{_id : "BE", _html: "Belgium"},
{_id : "BZ", _html: "Belize"},
{_id : "BJ", _html: "Benin"},
{_id : "BM", _html: "Bermuda"},
{_id : "BT", _html: "Bhutan"},
{_id : "BO", _html: "Bolivia"},
{_id : "BA", _html: "Bosnia And Herzegowina"},
{_id : "BW", _html: "Botswana"},
{_id : "BV", _html: "Bouvet Island"},
{_id : "BR", _html: "Brazil"},
{_id : "IO", _html: "British Indian Ocean Territory"},
{_id : "BN", _html: "Brunei Darussalam"},
{_id : "BG", _html: "Bulgaria"},
{_id : "BF", _html: "Burkina Faso"},
{_id : "BI", _html: "Burundi"},
{_id : "KH", _html: "Cambodia"},
{_id : "CM", _html: "Cameroon"},
{_id : "CA", _html: "Canada"},
{_id : "CV", _html: "Cape Verde"},
{_id : "KY", _html: "Cayman Islands"},
{_id : "CF", _html: "Central African Republic"},
{_id : "TD", _html: "Chad"},
{_id : "CL", _html: "Chile"},
{_id : "CN", _html: "China"},
{_id : "CX", _html: "Christmas Island"},
{_id : "CC", _html: "Cocos (Keeling) Islands"},
{_id : "CO", _html: "Colombia"},
{_id : "KM", _html: "Comoros"},
{_id : "CG", _html: "Congo"},
{_id : "CD", _html: "Congo, The Democratic Republic Of The"},
{_id : "CK", _html: "Cook Islands"},
{_id : "CR", _html: "Costa Rica"},
{_id : "CI", _html: "Cote D'Ivoire"},
{_id : "HR", _html: "Croatia (Local Name: Hrvatska)"},
{_id : "CU", _html: "Cuba"},
{_id : "CY", _html: "Cyprus"},
{_id : "CZ", _html: "Czech Republic"},
{_id : "DK", _html: "Denmark"},
{_id : "DJ", _html: "Djibouti"},
{_id : "DM", _html: "Dominica"},
{_id : "DO", _html: "Dominican Republic"},
{_id : "TP", _html: "East Timor"},
{_id : "EC", _html: "Ecuador"},
{_id : "EG", _html: "Egypt"},
{_id : "SV", _html: "El Salvador"},
{_id : "GQ", _html: "Equatorial Guinea"},
{_id : "ER", _html: "Eritrea"},
{_id : "EE", _html: "Estonia"},
{_id : "ET", _html: "Ethiopia"},
{_id : "FK", _html: "Falkland Islands (Malvinas)"},
{_id : "FO", _html: "Faroe Islands"},
{_id : "FJ", _html: "Fiji"},
{_id : "FI", _html: "Finland"},
{_id : "FR", _html: "France"},
{_id : "FX", _html: "France, Metropolitan"},
{_id : "GF", _html: "French Guiana"},
{_id : "PF", _html: "French Polynesia"},
{_id : "TF", _html: "French Southern Territories"},
{_id : "GA", _html: "Gabon"},
{_id : "GM", _html: "Gambia"},
{_id : "GE", _html: "Georgia"},
{_id : "DE", _html: "Germany"},
{_id : "GH", _html: "Ghana"},
{_id : "GI", _html: "Gibraltar"},
{_id : "GR", _html: "Greece"},
{_id : "GL", _html: "Greenland"},
{_id : "GD", _html: "Grenada"},
{_id : "GP", _html: "Guadeloupe"},
{_id : "GU", _html: "Guam"},
{_id : "GT", _html: "Guatemala"},
{_id : "GN", _html: "Guinea"},
{_id : "GW", _html: "Guinea-Bissau"},
{_id : "GY", _html: "Guyana"},
{_id : "HT", _html: "Haiti"},
{_id : "HM", _html: "Heard And Mc Donald Islands"},
{_id : "VA", _html: "Holy See (Vatican City State)"},
{_id : "HN", _html: "Honduras"},
{_id : "HK", _html: "Hong Kong"},
{_id : "HU", _html: "Hungary"},
{_id : "IS", _html: "Iceland"},
{_id : "IN", _html: "India"},
{_id : "ID", _html: "Indonesia"},
{_id : "IR", _html: "Iran (Islamic Republic Of)"},
{_id : "IQ", _html: "Iraq"},
{_id : "IE", _html: "Ireland"},
{_id : "IL", _html: "Israel"},
{_id : "IT", _html: "Italy"},
{_id : "JM", _html: "Jamaica"},
{_id : "JP", _html: "Japan"},
{_id : "JO", _html: "Jordan"},
{_id : "KZ", _html: "Kazakhstan"},
{_id : "KE", _html: "Kenya"},
{_id : "KI", _html: "Kiribati"},
{_id : "KP", _html: "Korea, Democratic People's Republic Of"},
{_id : "KR", _html: "Korea, Republic Of"},
{_id : "KW", _html: "Kuwait"},
{_id : "KG", _html: "Kyrgyzstan"},
{_id : "LA", _html: "Lao People's Democratic Republic"},
{_id : "LV", _html: "Latvia"},
{_id : "LB", _html: "Lebanon"},
{_id : "LS", _html: "Lesotho"},
{_id : "LR", _html: "Liberia"},
{_id : "LY", _html: "Libyan Arab Jamahiriya"},
{_id : "LI", _html: "Liechtenstein"},
{_id : "LT", _html: "Lithuania"},
{_id : "LU", _html: "Luxembourg"},
{_id : "MO", _html: "Macau"},
{_id : "MK", _html: "Macedonia, Former Yugoslav Republic Of"},
{_id : "MG", _html: "Madagascar"},
{_id : "MW", _html: "Malawi"},
{_id : "MY", _html: "Malaysia"},
{_id : "MV", _html: "Maldives"},
{_id : "ML", _html: "Mali"},
{_id : "MT", _html: "Malta"},
{_id : "MH", _html: "Marshall Islands"},
{_id : "MQ", _html: "Martinique"},
{_id : "MR", _html: "Mauritania"},
{_id : "MU", _html: "Mauritius"},
{_id : "YT", _html: "Mayotte"},
{_id : "MX", _html: "Mexico"},
{_id : "FM", _html: "Micronesia, Federated States Of"},
{_id : "MD", _html: "Moldova, Republic Of"},
{_id : "MC", _html: "Monaco"},
{_id : "MN", _html: "Mongolia"},
{_id : "MS", _html: "Montserrat"},
{_id : "MA", _html: "Morocco"},
{_id : "MZ", _html: "Mozambique"},
{_id : "MM", _html: "Myanmar"},
{_id : "NA", _html: "Namibia"},
{_id : "NR", _html: "Nauru"},
{_id : "NP", _html: "Nepal"},
{_id : "NL", _html: "Netherlands"},
{_id : "AN", _html: "Netherlands Antilles"},
{_id : "NC", _html: "New Caledonia"},
{_id : "NZ", _html: "New Zealand"},
{_id : "NI", _html: "Nicaragua"},
{_id : "NE", _html: "Niger"},
{_id : "NG", _html: "Nigeria"},
{_id : "NU", _html: "Niue"},
{_id : "NF", _html: "Norfolk Island"},
{_id : "MP", _html: "Northern Mariana Islands"},
{_id : "NO", _html: "Norway"},
{_id : "OM", _html: "Oman"},
{_id : "PK", _html: "Pakistan"},
{_id : "PW", _html: "Palau"},
{_id : "PA", _html: "Panama"},
{_id : "PG", _html: "Papua New Guinea"},
{_id : "PY", _html: "Paraguay"},
{_id : "PE", _html: "Peru"},
{_id : "PH", _html: "Philippines"},
{_id : "PN", _html: "Pitcairn"},
{_id : "PL", _html: "Poland"},
{_id : "PT", _html: "Portugal"},
{_id : "PR", _html: "Puerto Rico"},
{_id : "QA", _html: "Qatar"},
{_id : "RE", _html: "Reunion"},
{_id : "RO", _html: "Romania"},
{_id : "RU", _html: "Russian Federation"},
{_id : "RW", _html: "Rwanda"},
{_id : "KN", _html: "Saint Kitts And Nevis"},
{_id : "LC", _html: "Saint Lucia"},
{_id : "VC", _html: "Saint Vincent And The Grenadines"},
{_id : "WS", _html: "Samoa"},
{_id : "SM", _html: "San Marino"},
{_id : "ST", _html: "Sao Tome And Principe"},
{_id : "SA", _html: "Saudi Arabia"},
{_id : "SN", _html: "Senegal"},
{_id : "SC", _html: "Seychelles"},
{_id : "SL", _html: "Sierra Leone"},
{_id : "SG", _html: "Singapore"},
{_id : "SK", _html: "Slovakia (Slovak Republic)"},
{_id : "SI", _html: "Slovenia"},
{_id : "SB", _html: "Solomon Islands"},
{_id : "SO", _html: "Somalia"},
{_id : "ZA", _html: "South Africa"},
{_id : "GS", _html: "South Georgia, South Sandwich Islands"},
{_id : "ES", _html: "Spain"},
{_id : "LK", _html: "Sri Lanka"},
{_id : "SH", _html: "St. Helena"},
{_id : "PM", _html: "St. Pierre And Miquelon"},
{_id : "SD", _html: "Sudan"},
{_id : "SR", _html: "Suriname"},
{_id : "SJ", _html: "Svalbard And Jan Mayen Islands"},
{_id : "SZ", _html: "Swaziland"},
{_id : "SE", _html: "Sweden"},
{_id : "CH", _html: "Switzerland"},
{_id : "SY", _html: "Syrian Arab Republic"},
{_id : "TW", _html: "Taiwan"},
{_id : "TJ", _html: "Tajikistan"},
{_id : "TZ", _html: "Tanzania, United Republic Of"},
{_id : "TH", _html: "Thailand"},
{_id : "TG", _html: "Togo"},
{_id : "TK", _html: "Tokelau"},
{_id : "TO", _html: "Tonga"},
{_id : "TT", _html: "Trinidad And Tobago"},
{_id : "TN", _html: "Tunisia"},
{_id : "TR", _html: "Turkey"},
{_id : "TM", _html: "Turkmenistan"},
{_id : "TC", _html: "Turks And Caicos Islands"},
{_id : "TV", _html: "Tuvalu"},
{_id : "UG", _html: "Uganda"},
{_id : "UA", _html: "Ukraine"},
{_id : "AE", _html: "United Arab Emirates"},
{_id : "UM", _html: "United States Minor Outlying Islands"},
{_id : "UY", _html: "Uruguay"},
{_id : "UZ", _html: "Uzbekistan"},
{_id : "VU", _html: "Vanuatu"},
{_id : "VE", _html: "Venezuela"},
{_id : "VN", _html: "Viet Nam"},
{_id : "VG", _html: "Virgin Islands (British)"},
{_id : "VI", _html: "Virgin Islands (U.S.)"},
{_id : "WF", _html: "Wallis And Futuna Islands"},
{_id : "EH", _html: "Western Sahara"},
{_id : "YE", _html: "Yemen"},
{_id : "YU", _html: "Yugoslavia"},
{_id : "ZM", _html: "Zambia"},
{_id : "ZW", _html: "Zimbabwe"}
]