// JavaScript Document
function image_popup(img)
{
	var w, h;
	w = 400;
	h = 400;
	
	// center popup
	leftPosition = (screen.width) ? (screen.width-w) / 2 : 0;
	topPosition = (screen.height) ? (screen.height-h) / 2 : 0;
	
	myPopup = window.open('chair_popup.php?image=' + img, 'test','width=' + w + ',height=' + h + ',left=' + leftPosition + ',top=' + topPosition + ',resizable=1,location=1,status=1');
	if (!myPopup.opener)
		 myPopup.opener = self; 
}