function expandCollapse(elem)
	{
		var sections = ["sub_2"];
		
		if (document.getElementById){
			e = document.getElementById(elem);		
	
			if (e.style.display == "none" | e.style.display == ""){			 
					e.style.display = "block";				
			}else if (e.style.display == "block"){			
					e.style.display = "none";
			}else{
					e.style.display = "block";
			}	
			
			for(i=0; i< sections.length;  i++){
			   if(e.id != sections[i]){			
					 var array_elem = document.getElementById(sections[i]);						
					 if(array_elem.style.display == 'block'){					 								
						 array_elem.style.display = 'block';
					}			
			   }
		   }
		   
		}	
	}