function showBef(){
        var popwidth = 360;
        var popheight = 440;
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getScrollXY();


	var befdiv = document.getElementById("befpop");
        var leftpos = arrayPageScroll[0] + Math.round((arrayPageSize[2] - popwidth)/2);
        var toppos = arrayPageScroll[1] + Math.round((arrayPageSize[3] - popheight)/2);
	befdiv.style.left = leftpos + 'px';
	befdiv.style.top = toppos + 'px';
	new Ajax.Updater(befdiv, '/bef.html', {asynchronous:true, evalScripts:true});
	befdiv.style.display = "block";
	return;
}

function closeBef() {
	var befdiv = document.getElementById("befpop");
	befdiv.style.display = "none";
}


function getPageSize(){
  var xScroll, yScroll;
  if (window.innerHeight && window.scrollMaxY) {
    xScroll = document.body.scrollWidth;
    yScroll = window.innerHeight + window.scrollMaxY;
  } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
    xScroll = document.body.scrollWidth;
    yScroll = document.body.scrollHeight;
  } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
    xScroll = document.body.offsetWidth;
    yScroll = document.body.offsetHeight;
  }

  var windowWidth, windowHeight;
  if (self.innerHeight) { // all except Explorer
    windowWidth = self.innerWidth;
    windowHeight = self.innerHeight;
  } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
    windowWidth = document.documentElement.clientWidth;
    windowHeight = document.documentElement.clientHeight;
  } else if (document.body) { // other Explorers
    windowWidth = document.body.clientWidth;
    windowHeight = document.body.clientHeight;
  }

  // for small pages with total height less then height of the viewport
  if (yScroll < windowHeight) {
    pageHeight = windowHeight;
  } else {
    pageHeight = yScroll;
  }

  // for small pages with total width less then width of the viewport
  if (xScroll < windowWidth) {
    pageWidth = windowWidth;
  } else {
    pageWidth = xScroll;
  }

  arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
  return arrayPageSize;
}

function getScrollXY() {
  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 ];
}