function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {error_message = error_message + alerttxt;}
}
}

function validate_form(thisform)
{
with (thisform)
{
error_message="";
validate_required(first_name,"First Name" + "\n");
validate_required(last_name,"Last Name" + "\n");
validate_required(company,"Company" + "\n");
validate_required(title,"Title" + "\n");
validate_required(street,"Street" + "\n");
validate_required(city,"City" + "\n");
validate_required(state,"State/Province" + "\n");
validate_required(zip,"Zip" + "\n");
validate_required(country,"Country" + "\n");
validate_required(phone,"Phone" + "\n");
validate_required(email,"Email" + "\n");
if (error_message != ""){error_message = "The following fields must be filled in to continue.  " + "\n\n" + error_message;}
}
if (error_message != "")
{alert(error_message);return false} else {return true}
}