function on_off(ob)
{
	if (document.getElementById) 
	{	
		 if (document.getElementById(ob).style.display=='none')
		  {  
		   document.getElementById(ob).style.display='';
//		   document.location=lx;
          }
		 else
		  {
		   document.getElementById(ob).style.display='none';  
		  }
	}
	if(document.layers) 
	{ 
		if (document.layers[ob].style.display=='none')
		  {  
		   document.layers[ob].style.display='';
		   //document.location=lx;
		  }
		 else
		  {
		   document.layers[ob].style.display='none';  
		  }	  
	}
}

var old_ob;