function validate_form ( )
{
    valid = true;

var firstname=document.contactus.first_name.value;
var lastname=document.contactus.last_name.value;
var address=document.contactus.address.value;
//var street=document.contactus.street.value;
var city=document.contactus.city.value;
var state=document.contactus.state.value;
var province=document.contactus.province.value;
var zip=document.contactus.zip.value;
var country=document.contactus.country.value;
var telephone=document.contactus.telephone.value;
var email=document.contactus.email.value;
var comment=document.contactus.comment.value;

    if (( firstname== "" )||(lastname== "" )||(address== "" )||(city== "" )||(zip== "" ))
    {
        valid = false;
    }
    if (( country== "" )||(telephone== "" )||(email== "" )||(comment== "" ))
    {
        valid = false;
    }

    if (( state== "" )&&(province== "" ))
    {
        valid = false;
    }
    if(valid == false){
        alert ( "All fields marked with an asterisk (*) are required." );

    }
    return valid;
}