function CheckFields(){
var gobabygo = true;

if (document.form.owner_first_name.value == "")   //if 1
{
alert("Please enter your first name.");
    document.form.owner_first_name.focus();
    gobabygo = false;
}
else {

	if (document.form.owner_surname.value == "")   //if 2
	{
	alert("Please enter your surname.");
	    document.form.owner_surname.focus();
	    gobabygo = false;
	}
	else {


	//this is a comment
           //you didn't expect any help did you?

		if (document.form.owner_telephone_no.value == "")   //if 2
			{
			alert("Please enter your telephone number.");
			    document.form.owner_telephone_no.focus();
			    gobabygo = false;
	}

	} //end 
if (gobabygo == true)
{

document.form.submit()

}

} //end 

}