function clickCategory(cat) {
	
  var obj = document.getElementById('CatC'+cat);
  
  if (obj.style.display=='none'){
      
  	for (i=1; i<=6; i++){
  		obj = document.getElementById("CatC" + i.toString());
  	  	obj.style.display='none';
   	}
  }
  
  obj = document.getElementById('CatC'+cat);
  if(obj.style.display=='none')
  	obj.style.display='block';
  else if(obj.style.display=='block')
  	obj.style.display='none';
	
}