function showImage() {
	
	if ((screen.width<1024) && (screen.height<768))
	{
	myWindow=window.open('showimage.php?size=medium','myWindow','width=775,height=400,left=25,top=25,scrollbars=yes,resizable=no,location=no,directories=no,status=no');
	myWindow.focus();
	}
	else
	{
	myWindow=window.open('showimage.php?size=large','myWindow','width=975,height=500,left=25,top=25,scrollbars=yes,resizable=no,location=no,directories=no,status=no');
	myWindow.focus();
	}
}