function WindowOpen(PageName,imgwidth,imgheight){
	if(imgwidth > screen.width*0.8) imgwidth = screen.width*0.8;
	if(imgheight > screen.height*0.8) imgheight = screen.height*0.8;
	NewWindow = window.open(PageName,'image','scrollbars=1,resizable=1,width=' + imgwidth + ',height=' + imgheight + '\'');
}