function st2(t){
	var toggle = document.getElementById('toggle');
var as = toggle.getElementsByTagName('a');

for(i=1;i<=as.length;i++){
			
		tr = document.getElementById('dd'+i);
		ta = document.getElementById('aa'+i);
	
		if(t==i){
	 			
			  tr.style["display"]="block";
			 tr.style["visibility"]="visible";

					}
		else{
		  		
		 	  tr.style["display"]="none";
  		  tr.style["visibility"]="hidden";
		}
	  }

}