var aryRequired = new Array();
 var intArrayCount = 0;       
 function defineRequired(strElementName, strDisplayMessage, blnIsEmail, blnIsNumber)  { 
         var objRequired = new Object();
		 objRequired.ElementName = strElementName;
		 objRequired.DisplayMessage = strDisplayMessage;
		 objRequired.IsEmail = blnIsEmail;
		 objRequired.IsNumber = blnIsNumber;
		 aryRequired[intArrayCount] = objRequired;
		 intArrayCount++;    }
function checkForm(objForm)    {        //web tv bug fix 
 if (navigator.userAgent.indexOf("WebTV") == -1) {
 for (var i = 0; i < aryRequired.length; i++) {
 var blnFail = true;
 var objElement = eval("objForm." + aryRequired[i].ElementName);
 if (objElement.length && !objElement.type && document.images) {  //looping through element array
 for (var x = 0; x < objElement.length; x++) {
 if (objElement[x].checked && objElement[x].value != "") blnFail = false;}}
 else {
 if (objElement.value != "") { 
 if (aryRequired[i].IsEmail) { 
 if (CheckEmail(objElement.value)) blnFail = false; }
 else if (aryRequired[i].IsNumber) { if (!isNaN(objElement.value)) blnFail = false; }
 else blnFail = false;}}
 if (blnFail) {alert(aryRequired[i].DisplayMessage);
 if (objElement.length && !objElement.type) objElement[0].focus();
 else objElement.focus();
 return false;}}        // all elements passed, submit form 
 } return true; } 
 function CheckEmail(strData)     {
 var posAt = strData.indexOf("@")
 var strName = strData.substring(0, posAt)
 var strDomain = strData.substring(posAt+1, strData.length)
 var posDot = strDomain.indexOf(".")
 var strSubDomain = strDomain.substring(posDot+1,strDomain.length)
 if ( strName=="" || strDomain=="" || posDot < 1 || strSubDomain =="") return false;
 else return true;    }
 // Change these to the inputs you want required
 defineRequired("fname","Please Enter Your First Name");
 defineRequired("lname","Please Enter Your Last Name");
 defineRequired("email","Invalid Email address, Please enter a vaild email address.", true);