 <!--Form Validation script -->

    function validate() {
     
      var errStr = "Please complete the following fields before continuing:\n\n";
      var valid = true;  // innocent until proven guilty
    
      form=document.contact;	
      
      if (isNull(form.YourName.value)){
        errStr += '\tYour Name\n';
        valid = false;
      }
      
      if (isNull(form.mailfrom.value)){
        errStr += '\tYour Email\n';
        valid = false;
      }
      
      if (isNull(form.AdditionalComments.value)){
        errStr += '\tAdditional Comments\n';
        valid = false;
      }
     
      if (!valid) {
        alert(errStr);
      }else{
        
        if (isEmail(form.mailfrom.value)){
          alert("Enter Valid Email Address");
          return false;
        }
       }//else  
     return valid;
    }