function replace_img(){
	var b = document.getElementById("immagini");
	
if(b != null){
	var a = b.getElementsByTagName("IMG");
	for(var i = 0; i < a.length; i++) {
		 //a[i].height = 700;
		// alert(a[i].src);
		  app = a[i].src;
		 app = app.substring(27);
		 //alert (app);
		  a[i].src = "thumb.php?file="+app+"&sizex="+a[i].width*1.5+"&sizey="+a[i].height*1.5;
			//applyPopup(a[i]);
	}
	}
	
	}
	
	function getElementsByClassName(className, tag, elm){
	var testClass = new RegExp("(^|\\s)" + className + "(\\s|$)");
	var tag = tag || "*";
	var elm = elm || document;
	var elements = (tag == "*" && elm.all)? elm.all : elm.getElementsByTagName(tag);
	var returnElements = [];
	var current;
	var length = elements.length;
	for(var i=0; i<length; i++){
		current = elements[i];
		if(testClass.test(current.className)){
			returnElements.push(current);
		}
	}
	return returnElements;
}