function isEmpty(strfield1, strfield2, strfield3, strfield4, strfield5, strfield6) {

strfield1 = document.forms[0].first_name.value 
strfield2 = document.forms[0].last_name.value
strfield3 = document.forms[0].address.value
strfield4 = document.forms[0].city.value
strfield5 = document.forms[0].zip.value
strfield6 = document.forms[0].phone.value

    if (strfield1 == "" || strfield1 == null || !isNaN(strfield1) || strfield1.charAt(0) == ' ')
    {
    alert("First Name Is A Required Field")
    return false;
    }

    if (strfield2 == "" || strfield2 == null || strfield2.charAt(0) == ' ')
    {
    alert("Last Name Is A Required Field")
    return false;
    }

    if (strfield3 == "" || strfield3 == null || strfield3.charAt(0) == ' ')
    {
    alert("Address Is A Required Field")
    return false;
    }
	
	if (strfield4 == "" || strfield4 == null || strfield4.charAt(0) == ' ')
    {
    alert("City Is A Required Field")
    return false;
    }
	
	if (strfield5 == "" || strfield5 == null || strfield5.charAt(0) == ' ')
    {
    alert("Zip Code Is A Required Field")
    return false;
    }
	
	if (strfield6 == "" || strfield6 == null || strfield6.charAt(0) == ' ')
    {
    alert("Phone Number Is A Required Field")
    return false;
    }
    return true;
}

function isValidEmail(strEmail){
  validRegExp = /^[^@]+@[^@]+.[a-z]{2,}$/i;
  strEmail = document.forms[0].email.value;

    if (strEmail.search(validRegExp) == -1) 
   {
      alert('Please Enter A Valid Email Address');
      return false;
    } 
    return true; 
}

function check(form){
if (isEmpty(form.first_name)){
  if (isEmpty(form.last_name)){
    if (isEmpty(form.address)){
		if (isEmpty(form.city)){
			if (isEmpty(form.zip)){
				if (isEmpty(form.phone)){
					if (isValidEmail(form.email)){
		  return true; 
		  	  }
		  	}
		  }
		}
	  }
   }
}
return false;
}

function checkCheckBoxes() {
	if (
	document.WebInquiry.interest1.checked == false &&
	document.WebInquiry.interest2.checked == false &&
	document.WebInquiry.interest3.checked == false &&
	document.WebInquiry.interest4.checked == false && 
	document.WebInquiry.interest5.checked == false &&
	document.WebInquiry.interest6.checked == false) 
	{
		alert ('You must select at least one product you are looking for more information on!');
		return false;
	} else { 	
		return true;
	}
}