function toggle(cid)
{
  if (document.getElementById(cid).style.display == 'none')
  {document.getElementById(cid).style.display = 'block';}
  else
  {document.getElementById(cid).style.display = 'none';}
}

function check(formulier, message)
{
  for(i=0; i<formulier.elements.length; i++)
  {
     var name = formulier.elements[i].name;
     var isRequired = name.substring(0,4);
     if(isRequired=='req_')
     {
       if(formulier.elements[i].value=='')
       {
         alert(message);
         return false;
       }
     }
   }
}

function check2(formulier, message, message2)
{
  for(i=0; i<formulier.elements.length; i++)
  {
    var name = formulier.elements[i].name;
    var isRequired = name.substring(0,4);
    if(isRequired=='req_')
    {
      if(formulier.elements[i].value=='')
      {
        alert(message);
        return false;
      }
    }
    if(isRequired=='ema_')
    {
      var str=formulier.elements[i].value
      var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
      if (filter.test(str))
      {
      
      }
      else
      {
       alert(message2);
       return false;
      }

    }
  }
}

function popUp(url,w,h,scroll)
{
  tempW = w / 2;
  tempH = h / 2;
  t = (screen.availHeight / 2)-tempH - 30;
  l = (screen.availWidth / 2)-tempW;

  window.open(url,"PopUp","toolbar=no, top="+t+", left="+l+" ,location=no, directories=no, status=no, menubar=no, scrollbars="+scroll+", resizable=yes, width="+w+"px, height="+h+"px");
}