var submitcount=0;
 function validate() {
	if (document.customerform.fname.value == "") {
		alert('\nPlease include your first name')
		document.customerform.fname.select()
		document.customerform.fname.focus()
		return false;
	}
	if (document.customerform.lname.value == "") {
		alert('\nPlease include your last name')
		document.customerform.lname.select()
		document.customerform.lname.focus()
		return false;
	}
	if (document.customerform.email.value == "") {
		alert('\nPlease include your email address')
		document.customerform.email.select()
		document.customerform.email.focus()
		return false;
	}		
	if (document.customerform.email.value.indexOf('@',0)==-1 ||
    	document.customerform.email.value.indexOf('@',0)== 0 ||
    	document.customerform.email.value.indexOf('.',0)==-1) {
    	alert('\nInvalid email address.')
    	document.customerform.email.select()
    	document.customerform.email.focus()
    	return false;
    }
	if (document.customerform.phone.value == "") {
		alert('\nPlease include your phone number, we cannot call you otherwise')
		document.customerform.phone.select()
		document.customerform.phone.focus()
		return false;
	}
	if (submitcount == 0)
		{
	    submitcount++;
	    return true;
	    }
	   	else 
	    {
	    alert("This form has already been submitted.  Thanks!");
	    return false;
	    }
  }