    <!--
function popup(url,breedte,hoogte,name) {
 // opens a new window with url 'url'
 //  to open windows in top of each other give them a different name
 var pWidth=breedte; pHeight=hoogte; if (!name) name = "newWin";
 w = (window.screen.availWidth-pWidth)/2; h = (window.screen.availHeight-pHeight)/2; // center onscreen:
 newWin = window.open(url,name,"scrollbars=1,resizable=no,width="+pWidth+",height="+pHeight+",screenX="+w+",screenY="+h+",top="+h+",left="+w+"'");
 // if (!newWin.opener) newWin.opener = self;
 setTimeout("newWin.focus()",250); // put focus on new window
}


 function checknumber(e)
      {
        var key = '';
        var strCheck = '0123456789';
        var whichCode = (window.Event) ? e.which : e.keyCode;

        key = String.fromCharCode(whichCode);

        if (strCheck.indexOf(key) == -1) return false;
      return true;
      }

	function CheckOneRadio(CheckField){
        var imax = CheckField.length  
        for(var i=0;i<imax;i++)
        {
           if (CheckField[i].checked) {
            return true;
          } 
        }
        return false;
      }
      
		  function CheckOpenAnswer(CheckField){
        var imax = CheckField.length - 1
        if (!(CheckField[imax].checked)) {
            return false;
        }
        return true
      }

    function CheckAnswer(objCheckOpenAnswer,objOpenAnswer){


        if (objCheckOpenAnswer.checked) {
            objOpenAnswer.focus();
        }
        else
        {
            objOpenAnswer.value = '';
        }
    }

    function CanCheck(objThis,chk2){

        if (!(chk2.checked))
        {
            objThis.checked = false;
        }
    }

   function UnCheckQuestion(objchk,freeanswer){
        var imax = objchk.length
        for (var i = 0;i<imax;i++)
        {
           objchk[i].checked = false;
        }
        freeanswer.value = '';
    }

   function UnCheckQuestion2(objchk){
        var imax = objchk.length
 
        for (var i = 0;i<imax;i++)
        {
           objchk[i].checked = false;
        }
    }

    //-->

    //-->