function checkSome(which)
{
	for(i = 0; i < which.length; i++)
	{
        if(!document.forms[1].elements[ which[i] ].value)
    	{
      		var b = true;
    	}
  	}

    if (b)
    {
    	alert("U bent een verplicht veld vergeten in te vullen!");
     	return false;
    }
    else
    {
     	return true;
    }
}

function checkform(form) {
    for (var x=0; form.elements[x]; x++ ) {
        if (form.elements[x].value == ""){
            if(form.elements[x].className != "nocheck") {
            alert( "U bent iets vergeten in te vullen!" );
            form.elements[x].focus();
            return false ;
            }
        }
    }       
}