function open_window(url,x,y) 
{
	
	if(x==null){x=406;}
	if(y==null){y=600;}
	var mywin
	if(undefined!=mywin){mywin.close();}

	mywin = window.open(url,"mywin",'scrollbars=yes,resizable=0,width='+x+',height='+y+',left=150,top=150');

}
function hot(img)
{
	eval("document.images['" + img + "'].src = " + img + "on.src;");
}
function cold(img)
{
	eval("document.images['" + img + "'].src = " + img + "off.src;");

}