function getParentQueryParam(key){
		var val = getAllParentQueryParams()[key];
		return (val != undefined && val != "") ? val : null ;
	}
	
	function getAllParentQueryParams(){
		var qs=[];
		var params = window.parent.location.search.substring(1).split("&");
		
		for (var i=0; i<params.length; i++) {
			var keyVal = params[i].split("=");
			qs[ keyVal[0] ] = keyVal[1];
		}
		
		return qs;
	}