function isEmpty(elem, helperMsg){
	if(elem.value.length == 0){
		alert(helperMsg);
		elem.focus();
		return true;
	}
	return false;
}
/*  Premestena e v ns.js

function popUp(URL, mode) {
day = new Date();
id = day.getTime();
	if (mode == "news") {
		eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0, scrollbars=0, location=0, statusbar=0, menubar=0, resizable=0, width=620, height=475, left=100, top=60');");
	} else if (mode == 1) {
		eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0, scrollbars=0, location=0, statusbar=0, menubar=0, resizable=0, width=100, height=100, left=100, top=60');");
	} else if (mode == 2) {
		eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0, scrollbars=0, location=0, statusbar=0, menubar=0, resizable=0, width=550, height=670, left=100, top=60');");
	} else eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=600');");
}*/