function checkform(){

   if (document.enquiry.name.value=='') {
        rc=alert('Your Name is required.');
        return false;
    }
    if (document.enquiry.company.value=='') {
        rc=alert('Please include your Company Name');
        return false;

    }
    if (document.enquiry.telephone.value=='') {
        rc=alert('Your Telephone Number is required.');
        return false;
    }
    if (document.enquiry.email.value.indexOf('@')==-1) {
        rc=alert('Your E-mail Address is required.');
        return false;
    }
	
    if (document.enquiry.construction_type.value=='') {
        rc=alert('Please choose a Construction Type.');
        return false;
    }
    
    if (document.enquiry.power_output.value=='') {
        rc=alert('Please state Motor Power Output.');
        return false;
    }
    
    if (document.enquiry.poles.value=='') {
        rc=alert('Please choose the number of poles required.');
        return false;
    }
    
    return true;
}