function checkForm(obj) {
  var form = obj;
  var name = form.id;
  var valid = true;
  var msg = formInCompleteMsg+" \n\r";
 
  if (requiredFields[name]) {
    for (var i=0; i<requiredFields[name].length; i++) {
      el = form.elements[requiredFields[name][i]]; 
      if (el.type == "text" || 
          el.type == "hidden" ||
          el.type == "textarea") {
        if (el.value == "" || (requiredLabels[name][i].indexOf("mail",0)!=-1 && (el.value.indexOf("@",0)==-1 || el.value.indexOf(".",0)==-1))) {
          msg += "'" + requiredLabels[name][i]+"' \n\r";
          valid = false;
          swapVerplicht(el.name,"rood");
        }
        else swapVerplicht(el.name,"zwart");
      }
      else if (form.elements[requiredFields[name][i]].length) { // radio
      
        rvalid = false;
        for (var j=0; j<form.elements[requiredFields[name][i]].length; j++) {
          if (form.elements[requiredFields[name][i]][j].checked) {
            rvalid = true;
          }
        }
        
        if (!rvalid) {
          msg += "/ "+requiredLabels[name][i]+" \n\r";
          valid = false;
          swapVerplicht(requiredFields[name][i],"rood");
        }
        else swapVerplicht(requiredFields[name][i],"zwart");
      }
    }
  }
 
  if (valid) {
  
    return true;
  }
  else {
    if (is.ie) {
        getElt("Msg_"+name).innerHTML = "<marquee>"+msg+"</marquee>";
    }
    else alert(msg);
    return false;
  }
}

// --- FORMS ---

function getForm(formName,elt) { 

  if (is.opera || is.ns6comp) {
    return document.forms[formName];
  }
	else if ((is.ns4comp) || (is.ie4comp)) {
	
		if (getForm.arguments.length == 2) {
			return eval("elt.document." + formName);
		} else {
			return eval("document." + formName);
		}
	}
}

function formSubmit(elt,formName) { 
	formRef = getForm(formName,elt);
	formRef.submit();
}

function formReset(elt,formName) { 
	formRef = getForm(formName,elt);
	formRef.reset();
}

function swapVerplicht(name,color) {
  var buttonsExtraPath = buttonsImgPath.substring(0,buttonsImgPath.indexOf("buttons/"))+"extra/";
  var s = name;
  while (s.indexOf(".",0) != -1) {
    s = s.substring(0,s.indexOf(".",0))+"_"+s.substring(s.indexOf(".",0)+1,s.length);
  }
  swapImage(buttonsExtraPath+color+"blokje.gif","verplicht_"+s, getElt("allecontent"));
}

function submitForm() {

  var submitArray = submitForm.arguments;

var name = submitArray[submitArray.length-2];
  var layername = submitArray[submitArray.length-1];

  var form = getForm(name,getElt(layername)); 
  var valid = true;
  for (var i=0; i<submitArray.length-3; i+=2) {
    if (form.elements[submitArray[i]]) form.elements[submitArray[i]].value = submitArray[i+1];
  }
 if (checkForm(form)){
    form.submit();
  }  
}

function openPopup(url,name,attr) {
  popup = window.open(url,name,attr);
  return false;
}

function submitToPopup(name,layer1,layer2) { // zoek, atlas, opiniepeiling
  var form = layer2?getForm(name,getElt(layer1,layer2)):getForm(name,getElt(layer1));
  if (checkForm(form)) {
    var url = form.action;
    for (var i=0; i<form.elements.length; i++) {
      var obj = form.elements[i];
      if (obj.type=="select-one" && obj.options.selectedIndex != -1) url+="&"+obj.name+"="+obj.options[obj.options.selectedIndex].value;
      else if (obj.value != "") url+="&"+obj.name+"="+obj.value;
    }
    popup = window.open(url,"popup","height=475,width=775,"+popupAttributes);
  }
  return false;
}

function transferName(fname,elname,fpath) {
  var file_name = document.forms[fname].elements["uFile."+elname].value;
  file_name = file_name.substring(file_name.lastIndexOf("\\")+1,file_name.length);
  file_name = file_name.substring(file_name.lastIndexOf("/")+1,file_name.length);
  file_name = regExReplaceIcase(file_name,"[^a-z0-9_.-]","");
  document.forms[fname].elements["File."+elname+".Name"].value = file_name;
  document.forms[fname].elements["Mail."+elname+".$value"].value = fpath+file_name;
}

function fixDate(name,source,target) {
  var y = document.forms[name].elements[source+"_y"];
  var m = document.forms[name].elements[source+"_m"];
  var d = document.forms[name].elements[source+"_d"];
  
  var yVal = y.options[y.selectedIndex].value+"";
  var mVal = m.options[m.selectedIndex].value+"";
  var dVal = d.options[d.selectedIndex].value+"";
  
  var dateVal = yVal+mVal+dVal;
  
  document.forms[name].elements[target].value = (dateVal.length == 8)?dateVal:"";
}

function toggleMenu(name,n,alt) {
  if (document.all) {
    if (document.all[name]) {
      document.all[name][1-n].style.display = "none";
      document.all[name][n].style.display = "block";
    }
    else document.reload(alt);
  }
}

function toggleBlock(name,n) {
  if (document.all) {
    for (var i=0; i<document.all[name].length; i++) document.all[name][i].style.display = (n==i)?"block":"none";
  }
}


// ====================================================================
//       URLEncode and URLDecode functions
//
// Copyright Albion Research Ltd. 2002
// http://www.albionresearch.com/
//
// You may copy these functions providing that 
// (a) you leave this copyright notice intact, and 
// (b) if you use these functions on a publicly accessible
//     web site you include a credit somewhere on the web site 
//     with a link back to http://www.albionresarch.com/
//
// If you find or fix any bugs, please let us know at albionresearch.com
//
// SpecialThanks to Neelesh Thakur for being the first to
// report a bug in URLDecode() - now fixed 2003-02-19.
// ====================================================================
function URLEncode(stri)
{
	// The Javascript escape and unescape functions do not correspond
	// with what browsers actually do...
	var SAFECHARS = "0123456789" +					// Numeric
					"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +	// Alphabetic
					"abcdefghijklmnopqrstuvwxyz" +
					"-_.!~*'()";					// RFC2396 Mark characters
	var HEX = "0123456789ABCDEF";

	var plaintext = stri;
	var encoded = "";
	for (var i = 0; i < plaintext.length; i++ ) {
		var ch = plaintext.charAt(i);
	    if (ch == " ") {
		    encoded += "+";				// x-www-urlencoded, rather than %20
		} else if (SAFECHARS.indexOf(ch) != -1) {
		    encoded += ch;
		} else {
		    var charCode = ch.charCodeAt(0);
			if (charCode > 255) {
			    alert( "Unicode Character '" 
                        + ch 
                        + "' cannot be encoded using standard URL encoding.\n" +
				          "(URL encoding only supports 8-bit characters.)\n" +
						  "A space (+) will be substituted." );
				encoded += "+";
			} else {
				encoded += "%";
				encoded += HEX.charAt((charCode >> 4) & 0xF);
				encoded += HEX.charAt(charCode & 0xF);
			}
		}
	} // for

	return encoded;	
};

function URLDecode(stri)
{
   // Replace + with ' '
   // Replace %xx with equivalent character
   // Put [ERROR] in output if %xx is invalid.
   var HEXCHARS = "0123456789ABCDEFabcdef"; 
   var encoded = stri;
   var plaintext = "";
   var i = 0;
   while (i < encoded.length) {
       var ch = encoded.charAt(i);
	   if (ch == "+") {
	       plaintext += " ";
		   i++;
	   } else if (ch == "%") {
			if (i < (encoded.length-2) 
					&& HEXCHARS.indexOf(encoded.charAt(i+1)) != -1 
					&& HEXCHARS.indexOf(encoded.charAt(i+2)) != -1 ) {
				plaintext += unescape( encoded.substr(i,3) );
				i += 3;
			} else {
				alert( 'Bad escape combination near ...' + encoded.substr(i) );
				plaintext += "%[ERROR]";
				i++;
			}
		} else {
		   plaintext += ch;
		   i++;
		}
	} // while
   return plaintext;
};