function scr_center(scr,wx,wy)
{
	var x=(scr.width-wx)/2;
	var y=(scr.height-wy)/2;

	if (x<0) x=0;
	if (y<0) y=0;
	
	return "screenX="+x+",left="+x+",screenY="+y+",top="+y;
}

function clickimg(img,wx,wy)
{
	if (wx>window.screen.width) wx=window.screen.width;
	if (wy>window.screen.height) wy=window.screen.height;
	window.open("img.php?img="+img+"&width="+wx+"&height="+wy,"","resizable,toolbar=no,"+scr_center(window.screen,wx,wy)+",width="+wx+",height="+wy+",menubar=no,scrollbars");
	return false;
}