var prev = 'blank';
 function change_class(linkId){
 	if(prev != 'blank'){
		document.getElementById(prev).className = '';
	}
	if(prev == 'blank' && linkId != 'link1'){
		document.getElementById('link1').className = '';
	}
	document.getElementById(linkId).className = 'activestep';
	prev = linkId;
	document.getElementById(linkId).className = '';
	prev = linkId;
 }

function tab(theTable)
  {    
  
  i=1;    
  var linkname = '';
   while(i<=10)
   {
   if(theTable!="r"+i)
   {
    linkname="r"+i;
	if(document.getElementById(linkname)!=null)
	    document.getElementById(linkname).style.display = 'none';
   } 
   i++;
   }     
   if (document.getElementById(theTable).style.display == 'none')
   {
   
     document.getElementById(theTable).style.display = 'block';
   }
   else
   {
    document.getElementById(theTable).style.display = 'block';
   }
  }
 //