var _POPUP_width = 500;
var _POPUP_height = 500;
var _POPUP_FEATURES = 'location=0,statusbar=0,menubar=0, scrollbars=yes,width=' + _POPUP_width + ',height=' + _POPUP_height + ',left=' + ((screen.width/2) - (_POPUP_width/2)) + ',top=' + ((screen.height/2) - (_POPUP_height/2));

function link_popup(obj)
{
	var theWindow = window.open(obj.href, 'popup_win', _POPUP_FEATURES);
	theWindow.focus();
}