function toggle(div_id) {
	var el = document.getElementById(div_id);
	if ( el.style.display == 'none' ) {	el.style.display = 'block'; }
	else {el.style.display = 'none';}
}
function blanket_size(popUpDivVar, width, addheight) {
	if (typeof window.innerWidth != 'undefined') {
		viewportheight = window.innerHeight;
	} else {
		viewportheight = document.documentElement.clientHeight;
	}
	if ((viewportheight > document.body.parentNode.scrollHeight) && (viewportheight > document.body.parentNode.clientHeight)) {
		blanket_height = viewportheight;
	} else {
		if (document.body.parentNode.clientHeight > document.body.parentNode.scrollHeight) {
			blanket_height = document.body.parentNode.clientHeight;
		} else {
			blanket_height = document.body.parentNode.scrollHeight;
		}
	}
	var blanket = document.getElementById('blanket');

	if(addheight != null)
		blanket_height = blanket_height+addheight;

	blanket.style.height = blanket_height + 'px';

	var popUpDiv = document.getElementById(popUpDivVar);
	popUpDiv_height=blanket_height/2-(width/2);//150 is half popup's height
	//popUpDiv.style.top = popUpDiv_height + 'px';
}
function window_pos(popUpDivVar, width) {
	if (typeof window.innerWidth != 'undefined') {
		viewportwidth = window.innerHeight;
	} else {
		viewportwidth = document.documentElement.clientHeight;
	}


	if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
		window_width = viewportwidth;
	} else {
		if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
			window_width = document.body.parentNode.clientWidth;
		} else {
			window_width = document.body.parentNode.scrollWidth;
		}
	}
	var popUpDiv = document.getElementById(popUpDivVar);
	window_width=window_width/2-(width/2);//150 is half popup's width

	popUpDiv.style.left = window_width + 'px';
}

function getScrollXY(value) {
  var scrOfX = 0, scrOfY = 0;
  if( typeof( window.pageYOffset ) == 'number' ) {
    //Netscape compliant
    scrOfY = window.pageYOffset;
    scrOfX = window.pageXOffset;
  } else if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) {
    //DOM compliant
    scrOfY = document.body.scrollTop;
    scrOfX = document.body.scrollLeft;
  } else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) {
    //IE6 standards compliant mode
    scrOfY = document.documentElement.scrollTop;
    scrOfX = document.documentElement.scrollLeft;
  }
  //return [ scrOfX, scrOfY ];

  if(value == 'x')
  	return scrOfX;
  else
  	return scrOfY;
}


var overlayOpen = 0;
function popup(windowname, width, direction, top, addheight) {

	if(top == null)
		top = 35;

	paddingTop = getScrollXY('y')+top;
	blanket_size(windowname, width, addheight);

	if(direction == 'open')
	{
		document.getElementById(windowname).style.top = paddingTop+'px';
		Effect.toggle('blanket', 'appear', { from: 0, to: 0.4, duration: 0.4 });
		overlayOpen = 1;
	}
	else
	{
		if(overlayOpen == 1)
		{
			Effect.toggle('blanket', 'appear', { from: 0.4, to: 0, duration: 0.4});
			overlayOpen = 0;
		}
	}

	Effect.toggle(windowname, 'appear', { duration: 0.4 });
	setTimeout('enlarger()', 2000);
}

function enlarger()
{
	blanket_size('blanket', null, 0);
}