function zip(form){
	
    zip = form.entry.value;
	
    if (zip >= 27006 && zip <= 30999) {document.location="zipcode1.html";}
	
	else if (zip >= 31000 && zip <= 34997) {document.location="zipcode2.html";}
		
	else if (zip >= 35004 && zip <= 39901) {document.location="zipcode3.html";}
	
	else {document.location="ziperror.html";}
}