/*
 ********************************************
 * Shop-Scripts (c) by Pascal Pfiffner 2005 *
 ********************************************
 */

function myCenterWindow(path, width, height) {
	var screenheight = screen.availHeight || screen.height || 1024;
	var screenwidth = screen.availWidth || screen.width || 768;
	
	width = width ? width : 600;
	height = height ? height : 600;
	
	var addition = "width=" + width + ", height=" + height + ", top=60, left=" + ((screenwidth - width) / 2) + ", status=yes, menubar=no, scrollbars=auto";
	var ewok = window.open(path, "popup", addition);
	ewok.focus();
}

function showImage(add) {				// -1 gets prev image, 1 the next
	if(images && images.length > 0) {
		var pr_img = getObj('prev');
		var nex_img = getObj('next');
		pr_img.style.display = 'inline';
		nex_img.style.display = 'inline';
		
		var show = 1* currentImage + add;
		if(show <= 0) {
			pr_img.style.display = 'none';
			show = 0;
		}
		else if((show + 1) >= images.length) {
			nex_img.style.display = 'none';
		}
		else if(show >= images.length) {
			show = images.length;
		}
		
		currentImage = show;
		getObj("main_image").src = images[show].src;
	}
	else {
		alert("no images defined");
	}
}

function getObj(id) {
	var obj = (document.getElementById) ? document.getElementById(id) : document.all[id];
	return obj;
}