function isNumeric(n) {
    return !isNaN(parseFloat(n)) && isFinite(n);
}
function isEmail(email) {
    var re = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
    return re.test(email);
}


function checkform ( form ) {



    if (form.elements['first_name'].value == "") {
	alert( "Please enter the " );
	form.elements['first_name'].focus();
	return false ;
    }



    if (form.elements['last_name'].value == "") {
	alert( "Please enter the " );
	form.elements['last_name'].focus();
	return false ;
    }



    if (form.elements['email'].value == "") {
	alert( "Please enter the " );
	form.elements['email'].focus();
	return false ;
    }



    if (form.elements['phone'].value == "") {
	alert( "Please enter the " );
	form.elements['phone'].focus();
	return false ;
    }



    if (form.elements['00N30000008PU9Y'].value == "") {
	alert( "Please enter the " );
	form.elements['00N30000008PU9Y'].focus();
	return false ;
    }



    if (form.elements['country'].value == "") {
	alert( "Please enter the " );
	form.elements['country'].focus();
	return false ;
    }



    if (form.elements['company'].value == "") {
	alert( "Please enter the " );
	form.elements['company'].focus();
	return false ;
    }


    if (form.elements['00N30000008PvfD'].value != '' && !isNumeric(form.elements['00N30000008PvfD'].value)) {
    alert(" must be a number");
    form.elements['00N30000008PvfD'].focus();
    return false;
    }
    if (form.elements['00N30000008PzWt'].value != '' && !isNumeric(form.elements['00N30000008PzWt'].value)) {
    alert(" must be a number");
    form.elements['00N30000008PzWt'].focus();
    return false;
    }
    if (form.elements['00N30000008PzWy'].value != '' && !isNumeric(form.elements['00N30000008PzWy'].value)) {
    alert(" must be a number");
    form.elements['00N30000008PzWy'].focus();
    return false;
    }
    if (form.elements['00N30000008PzXD'].value != '' && !isNumeric(form.elements['00N30000008PzXD'].value)) {
    alert(" must be a number");
    form.elements['00N30000008PzXD'].focus();
    return false;
    }
    if (form.elements['email'].value != '' && !isEmail(form.elements['email'].value)) {
    alert(" must be a valid email address.");
    form.elements['email'].focus();
    return false;
    }

    if (form.elements['00Na000000BRKfE'].value != '' && !isEmail(form.elements['00Na000000BRKfE'].value)) {
    alert(" must be a valid email address.");
    form.elements['00Na000000BRKfE'].focus();
    return false;
    }


}