function addLoadEvent(func) {	
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
		window.onload = func;
	} else {
		window.onload = function(){
			oldonload();
			func();
		}
	}
}

function checkActiveLinks(base) {
	if(typeof(base) == 'undefined' && typeof(document.path) != 'undefined') base = document.path;
	
	linksArray = $$('a');
	
	var url = window.location;
	
	for(i = 0; i < linksArray.length; ++i ){
		var a = linksArray[i];
		
		url = new String(window.location);
		
		var link = a.href
		if(link.substring(link.length-4, link.length) == '.ait') link = link.substring(0, link.length-4)
		
		if(link == url || (link != base && link == url.substring(0, link.length))) {
			if(url.length <= link.length || (url.length > link.length && (url.substring(link.length, link.length+1) == '/' || url.substring(link.length, link.length+4) == '.ait'))) {
				a.className += ' active';		
			}
		}
	}
}

function isInt(x) {
	var y=parseInt(x);
	if (isNaN(y)) return false;
	return x==y && x.toString()==y.toString();
}