function popup_invite()
{
 openPopupCenter(716, 570, href_regular, 'mywindow', false);
}
function openPopupCenter(popupwidth, popupheight, strPath, strName, boolWriteWait) 
{
    var popup_width  = popupwidth;
    var popup_height = popupheight;
    var screen_width = window.screen.width;
    var screen_height = window.screen.height;
    var popup_left  = Math.round((screen_width-popup_width)/2);
    var popup_top  = Math.round((screen_height-popup_height)/2);
 
    var popupwindow  = window.open(strPath, strName, "status,height="+popup_height+",width="+popup_width+",resizable=no,left="+popup_left+",top="+popup_top+",scrollbars=0,menubar=0,status=1,fullscreen=0");
}