//<![CDATA[   	
    	function showTop() {
        // for IE6.0    
        if ((BrowserDetect.browser == "Explorer") && (BrowserDetect.version<7)) {          
          if (document.body.clientHeight > document.documentElement.clientHeight ) {     
            document.getElementById('screenoverlay').style.height = document.body.clientHeight;
          } else {
            document.getElementById('screenoverlay').style.height = document.documentElement.clientHeight;
          }
          
          if (document.body.clientWidth > document.documentElement.clientWidth ) {     
            document.getElementById('screenoverlay').style.width = document.body.clientWidth;
          } else {
            document.getElementById('screenoverlay').style.width = document.documentElement.clientWidth;
          }          
        }  
    
    		//Show the background overlay and topbox...
    		document.getElementById('screenoverlay').style.visibility = 'visible';
    		document.getElementById('topbox').style.display = 'block';
        verticallyCenter('topbox');
    	}  	
   	
    	function closeTop()	{
    		//Hide the overlay and tobox...
    		document.getElementById('screenoverlay').style.visibility = 'hidden';
    		document.getElementById('topbox').style.display = 'none';
    	}     
      
      function viewportSize(side) {
        var viewportWidth;
        var viewportHeight;
     
        // for standards compliant browsers (mozilla/netscape/opera/IE7)     
        if (typeof window.innerWidth != 'undefined') {
          viewportWidth = window.innerWidth,
          viewportHeight = window.innerHeight
        }        
        // IE6 in standards compliant mode (i.e. with a valid doctype)    
        else if (typeof document.documentElement != 'undefined' && typeof document.documentElement.clientWidth != 'undefined' && document.documentElement.clientWidth != 0) {
         viewportWidth = document.documentElement.clientWidth,
         viewportHeight = document.documentElement.clientHeight
        }        
        // older versions of IE
        else {
         viewportWidth = document.getElementsByTagName('body')[0].clientWidth,
         viewportHeight = document.getElementsByTagName('body')[0].clientHeight
        }  
 
        return (side == 'width' ? viewportWidth : viewportHeight);
      } 
 
      window.onresize = function() {verticallyCenter('topbox')};
      
      function verticallyCenter(id) {
        var elementHeight=document.getElementById(id).offsetHeight;
        var elementWidth=document.getElementById(id).offsetWidth;
        
        document.getElementById(id).style.top = (viewportSize('height')-elementHeight)/2+"px";
        document.getElementById(id).style.left = (viewportSize('width')-elementWidth)/2+"px";        
      }
    //]]>