$(document).ready(function()
{
    $('.Popup').click(function()
    {
        var left   = (screen.width  - 700)/2;
        var top    = (screen.height - 300)/2;
 
	    window.open(this.href, 'PopupWin', 'top=' + top + ',left=' + left + 'location=no,scrollbars=1,menubar=1,resizable=1,width=700,height=300'); 
	    return false;
	});
});