function changeBg()
{
	var bgNum = $chk(Cookie.get('bgNum')) ? Cookie.get('bgNum').toInt() + 1 : 1;
	
	if(bgNum > 5) bgNum = 1;
	$$('body').set('class', 'bg_' + bgNum);
	Cookie.set('bgNum', bgNum);
}
function setImage()
{
	var bgNum = $chk(Cookie.get('bgNum')) ? Cookie.get('bgNum').toInt(): $random(1,6);
	$$('body').set('class', 'bg_' + bgNum);
	Cookie.set('bgNum', bgNum);
}

// site functions
// Popup Window (Centred)
function popup(url,winname,w,h,feat) {
	if (!(isNaN(w) || isNaN(h))) {
		var x=parseInt((screen.width-w)/2);
		var y=parseInt((screen.height-h)/2);
		if (x<0)	x=0;
		if (y<0)	y=0;
		
		if (feat!=null && feat!="") {
			feat=","+feat;
		} else {
			feat="";
		}
		feat="left="+x+",top="+y+",width="+w+",height="+h+feat;
	}
	window.open(url,winname,feat,false);
}