function zoom (image) {
	var chasm = screen.availWidth;
	var mount = screen.availHeight;
	var ie = /msie/i;
	var w = 750;
	var h = 420;

	var features =
		'width=' + w + 
		',height=' + h + 
		',left=' + ((chasm - w - 10) * .5) + 
		',top=' + ((mount - h - 150) * .5);
			
	if (!new_window) 
	{
		var new_window = window.open ('zoom.php?image='+image, 'iyengar', features);
		if (new_window) new_window.focus();
	}
}