1 function toggle(div_id)

     2 {

     3 	var el = document.getElementById(div_id);

     4 	if ( el.style.display == 'none' ) {	el.style.display = 'block';}

     5 	else {el.style.display = 'none';}

     6 }

     7 

     8 var popupOn = false;

     9 function popupPosition(windowname, contantId)

    10 {

    11 	if (!popupOn) {

    12 		return;

    13 	}

    14 	var blanket_height = $("#" + contantId).height();

    15 	var window_width = $("#" + contantId).width();

    16 

    17 	var blanket = $("#blanket");

    18 

    19 	var popup = $("#"+windowname);

    20 	var popupHeight = popup.height();

    21 	var popupTop = (blanket_height - popupHeight) / 2;

    22 	popup.css({"top" : + popupTop +'px'});

    23 

    24 	var popupWidth = popup.width();

    25 	var popupLeft = (window_width - popupWidth) / 2;

    26 	popup.css({"left" : + popupLeft +'px'});	

    27 }

    28 

    29 function popup(windowname, contantId)

    30 {

    31 	popupOn = !popupOn;

    32 	popupPosition(windowname, contantId);

    33 	toggle('blanket');

    34 	toggle(windowname);

    35 }