// validation constants
var TEXT = 1;
var CHECKBOX = 2;
var RADIO = 3;

// validation for required fields
function validateForm(params,formname) {
	// true if no items passed
	if (params == null || params.length == 0) return true;
	if (formname == null) formname = "form";
	var form = eval("document."+formname);
	// doesn't validate if it can't find the form
	if (!form) return true;
	var invalidFields = "";
	for (var i = 0; i < params.length; i++) {
		var param = params[i];
		var p_name = param[0];
		var p_type = param[1];
		var p_req = param[2];
		
		// validate fields by field type
		if (p_type == TEXT && p_req) invalidFields += checkText(p_name);
		else if (p_type == CHECKBOX && p_req) invalidFields += checkCheckbox(p_name);
		else if (p_type == RADIO && p_req) invalidFields += checkRadio(p_name);
	}
	
	// return error message
	if (invalidFields.length > 0) {
		alert("The following fields are required:\n"+invalidFields);
		return false;
	} else return true;
	
	// text field validation
	function checkText(n) {
		var field = form[n];
		if (!field) return "";	// valid if field doesn't exist
		if (field.disabled) return "";	// valid if disabled
		if (field.value.length == 0) return "\n - "+field.title;
		return "";
	}
	// checkbox validation
	function checkCheckbox(n) {
		var check = form[n];
		if (!check || !check[0]) return "";		// valid if check doesn't exist
		var hasCheck = false;
		var isDisabled = true;
		for (var j = 0; j < check.length; j++) {
			var chk = check[j];
			if (!chk.disabled) isDisabled = false;
			if (chk.checked) {
				hasCheck = true;
				break;
			}
		}
		if (!isDisabled && !hasCheck) return "\n - "+check[0].title;
		return "";
	}
	// radio button validation
	function checkRadio(n) {
		var radio = form[n];
		if (!radio || !radio[0]) return "";		// valid if radio doesn't exist
		var hasCheck = false;
		var isDisabled = true;
		for (var j = 0; j < radio.length; j++) {
			var rdo = radio[j];
			if (!rdo.disabled) isDisabled = false;
			if (rdo.checked) {
				hasCheck = true;
				break;
			}
		}
		if (!isDisabled && !hasCheck) return "\n - "+radio[0].title;
		return "";
	}
}
function MM_preloadImages() { //v3.0
 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
   var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
   if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}