function checkEvent()
{
  var allCk=document.getElementById('selall');
  var names=document.getElementsByName('categories_id[]');
  var len=names.length;
  
  if(allCk.checked==true){
    var sts = true;
  }else{
    var sts = false;
  }
  if(len>0)
  {
   var i=0;
   for(i=0;i<len;i++)
   names[i].checked=sts;
  }
  
}
function checkcate()
{
  var allCk=document.getElementById('selall');
  var names=document.getElementsByName('categories_id[]');
  var len=names.length;
  var cate = true;
  var v = '';
  
  if(len>0){
   for(i=0;i<len;i++)
   if(names[i].checked == false){
	   cate = false;
   }else{
	  if(v == ''){v = v + names[i].value; }else{v = v + ';' + names[i].value; }
   }
  }
  document.getElementById('categoriesid').value = v;
  
  if(cate == true){
    allCk.checked = true;
  }else{
    allCk.checked = false;
  }
  
}