function getQueryString(key)
{
    var value = ""; 
    var sURL = window.document.URL;

    if (sURL.indexOf("?") > 0)
    {
	    var arrayParams = sURL.split("?");
	    var arrayURLParams = arrayParams[1].split("&");

	    for (var i = 0; i < arrayURLParams.length; i++)
	    {
		    var sParam =  arrayURLParams[i].split("=");                   

		    if ((sParam[0] == key) && (sParam[1] != ""))
		    {
			    value = sParam[1];
			    break;
		    }
	    }
    }

    return value;
}