Javascript Numeric Form Validation

function validateForm(form) { //This is the name of the function
 
  
    var emailID=form.email;
    if (form.ORDERREF.value == "") { //This checks to make sure the field is not empty
   alert("Please Fill in your purchase order reference, this is important so we can process your order."); //Informs user of empty field
   form.ORDERREF.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
    if (form.partno1.value == "") { //This checks to make sure the field is not empty
   alert("You Must Enter At least 1 Part Number."); //Informs user of empty field
   form.partno1.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
   if (form.account.value == "") { //This checks to make sure the field is not empty
   alert("Please Fill in your account code correctly, this is important so we can process your order."); //Informs user of empty field
   form.account.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
      if (form.ADDRESS1.value == "") { //This checks to make sure the field is not empty
   alert("Please Fill in your first address line."); //Informs user of empty field
   form.ADDRESS1.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
         if (form.DELIVERYADDRESS1.value == "") { //This checks to make sure the field is not empty
   alert("Please Fill the first address line for delivery."); //Informs user of empty field
   form.DELIVERYADDRESS1.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
    if (form.contact.value == "") { //This checks to make sure the field is not empty
   alert("Please give us a contact name so we can call you if there are any problems with your order."); //Informs user of empty field
   form.contact.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
    if (form.phone.value == "") { //This checks to make sure the field is not empty
   alert("Please give us a contact phone number so we can call you if there are any problems with your order."); //Informs user of empty field
   form.phone.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
    if ((emailID.value==null)||(emailID.value=="")){
        alert("Please Enter your Email ID")
        emailID.focus()
        return false
    }
    if (echeck(emailID.value)==false){
        emailID.value=""
        emailID.focus()
        return false
		}
				 	if ((form.email.value !== form.email2.value)) {
	alert ("Your email address is not matching")
	form.email2.focus();
	return false;
	}
     if (form.message.value == "") { //This checks to make sure the field is not empty
   alert("Enter the postcode where you want the item dispatched to in the message field."); //Informs user of empty field
   form.message.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
    if (form.message.value == "Your Order Reference , delivery postcode and Message") { //This checks to make sure the field is not empty
   alert("Enter the postcode where you want the item dispatched to in the message field."); //Informs user of empty field
   form.message.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   
    }
    return true
 }
</SCRIPT>