var artWindow = null;
centerX = (screen.availWidth-768)/2;
centerY = (screen.availHeight-428)/2;

function openArtWindow(what_url) { //v2.0
	if (artWindow){
		if (!artWindow.closed){
			artWindow.focus();
		}
	}
	if(plat == "Mac" && ie) {
		artWindow = window.open(what_url,'shop','width=752,height=413,screenX='+centerX+',screenY='+centerY+',top='+centerY+',left='+centerY);
	} else {
		artWindow = window.open(what_url,'shop','width=768,height=428,screenX='+centerX+',screenY='+centerY+',top='+centerY+',left='+centerY);
	}
}