lists = document.getElementsByTagName("ul");
        for (var i = lists.length - 1; i >= 0; i--)
        {
          if (lists[i].className == "select")
          {
            sel = document.createElement("select");
            sel.onchange = function() { location.href = this.options[this.selectedIndex].value; }
              
            items = lists[i].getElementsByTagName("li");
            
            for (var j = 0; j < items.length; j++)
            {
              optie = document.createElement("option");
              par = items[j].getElementsByTagName("a")[0];
              optie.value = par.href;
              optie.appendChild(document.createTextNode(par.firstChild.nodeValue));
              sel.appendChild(optie);
            }
            lists[i].parentNode.insertBefore(sel, lists[i]);
            lists[i].parentNode.removeChild(lists[i]);
          }
        }
			var x=document.getElementById("afstand")
    x.disabled=true
	var x=document.getElementById("submit_postcode")
 x.disabled=true
  
function makeEnablea(){
	var f = document.forms.sidebarSearch2; // formulier variabele
	f.postcode.value = f.postcode.value.replace(/ /g,'').toUpperCase();
	if (!f.postcode.value.match(/^[1-9]\d{3}[A-Z]{2}$/)) {
		document.getElementById("meldingpostcode").style.display = "block";
	// foutmelding
	}else
	{
	   		document.getElementById("meldingpostcode").style.display = "none";
			var x=document.getElementById("afstand")
			x.disabled=false
			var x=document.getElementById("submit_postcode")
    		x.disabled=false
	}
	}