function readGetVars () {
	var vars = document.location.search.substring(1, document.location.search.length).split('&');
	var getVars = new Object();
	
	for(var i=0; i<vars.length; i++){
		var temp = vars[i].split('=');
		getVars[temp[0]] = temp[1];
	}
	return getVars;
}
function isset(variable) {
	return (typeof variable != "undefined") ? true : false;
}