function goBack() {
	// document.referrer
	
	if(navigator.product && navigator.product == "Gecko") emptyHistoryLength = 1;
	else emptyHistoryLength = 0;
	
	if(history.length > emptyHistoryLength) {
		history.back();
		return false;
	}
	else return true;
}
//---------------------------------------------------------------------------------------------------------------
function change(img) {
	var bgimg = document.images["big"];
	
	var src = img.src;
	src = src.replace(/s.jpg/, ".jpg");
	
	var bgsrc = bgimg.src;
	bgsrc = bgsrc.replace(/.jpg/, "s.jpg");
	
	img.src = bgsrc;
	bgimg.src = src;
}

var prefix = "";

function preload(pref) {
	if(pref != "") {
		var imgb = new Array();
		var imgs = new Array();
		
		for(var i=0; i<3; i++) {
			imgb[i] = new Image();
			imgb[i].src = pref + (i+1) + ".jpg";
			
			imgs[i] = new Image();
			imgs[i].src = pref + (i+1) + "s.jpg";	
		}
	}
}