function show(id) {
var e = document.getElementById(id);
if(e && e.style.display != "block") {
e.style.display = "block";
}
}

function hide(id) {
var e = document.getElementById(id);
if(e && e.style.display != "none") {
e.style.display = "none";
}
}

function showhide(id) {
var idx = document.contact.inquiry.selectedIndex;
var opt = document.contact.inquiry.options;

if( opt[idx].value == "services") show(id);
else hide(id);
}