function toggle(id)
 { 
 var tr = document.getElementById(id); if (tr==null) 
 { 
 return;
  }
   var bExpand = tr.style.display == ''; tr.style.display = (bExpand ? 'none' : ''); 
   }
    function changeimage(id, sMinus, sPlus)
	 {
	  var img = document.getElementById(id); if (img!=null)
	   {
	    var bExpand = img.src.indexOf(sPlus) >= 0; if (!bExpand) img.src = sPlus; else img.src = sMinus;
		 }
		  }
		   function Toggle_trGrpHeader1() {
		  
		   changeimage('trGrpHeader1_Img', '/web-seminars/images/all/plus.gif', '/web-seminars/images/all/minus.gif'); toggle('expandarea');
			 }