var getVars = [];
var strGET = document.location.search.substr(1,document.location.search.length);

if(strGET != '') {
    var gArr = strGET.split('&');

    if (gArr.length >= 1) {
        if (gArr[0].split('=').length == 2) {
            for(var i = 0; i < gArr.length; ++i) {
                var v = '';
                vArr = gArr[i].split('=');
                getVars[vArr[0]] = vArr[1];
            }
        } else {
            getVars[gArr[0]] = 'defined';
        }
    }
}

function GET(v) {
    if(!getVars[v]) {
        return null;
    }
    return getVars[v];
}