function preload_images(images) {

	for(var i=0; i<images.length; i++) {

		var img = new Image();
		img.src = images[i];
	}
}

function swap_image(id, filename) {

	var obj = document.getElementById(id);
	var img = new Image();

	img.src = filename;
	obj.src = img.src;
}

function trovaCSS() {

	var styleSheet = new Array();
	
	styleSheet["default"] = "css/style.css";
	styleSheet["800x600"] = "css/style.css";
	styleSheet["1024x768"] = "css/style.css";
	styleSheet["1152x864"] = "css/style1004.css";
	styleSheet["1280x960"] = "css/style1004.css";
	styleSheet["1280x1024"] = "css/style1004.css";
	styleSheet["1600x1024"] = "css/style1004.css";
	styleSheet["1600x1200"] = "css/style1004.css";
	styleSheet["1920x1080"] = "css/style1004.css";	

	var xSize = window.screen.width;
	var ySize = window.screen.height;
	
	var risoluzione = xSize + "x" + ySize;
	
	if (styleSheet[risoluzione] == "undefined" || styleSheet[risoluzione] == "" || styleSheet[risoluzione] == null) {
		risoluzione = "default";
	}
	
	var obj = document.getElementById("cssLnk");
	
	obj.href = styleSheet[risoluzione];
}

function trim(stringa){

	while (stringa.substring(0,1) == ' '){
		stringa = stringa.substring(1, stringa.length);
	}
	while (stringa.substring(stringa.length-1, stringa.length) == ' '){
		stringa = stringa.substring(0,stringa.length-1);
	}
	return stringa;
}