function validateForm() { 

if(document.contactform.state.value=="") { 

alert("Please enter your state");
return false;

} else if(document.contactform.zip.value=="") { 

alert("Please enter your zipcode");
return false;

} else if(document.contactform.name.value=="") { 

alert("Please enter your name");
return false;

} else if((document.contactform.phone.value=="") && (document.contactform.email.value=="")) { 

alert("Please enter your preferred method of contact"); 
return false;

} else {

return true;

}

}