// preload function
function preload(image) {
	eval(image+"_0 = new Image()");	eval(image + "_0.src = 'http://www.airengineering.com/images/" + image + ".gif'");
	eval(image+"_1 = new Image()");	eval(image + "_1.src = 'http://www.airengineering.com/images/" + image + "_over.gif'");
}
// rollover function
function rollover(thisImg,state) {
	if (document.images) 
		document.images[thisImg].src = eval(thisImg + "_" + state + ".src");
}
// page variables
nav = new Array("head2head","techhelp","prodinfo","aboutae","requestquote","shop");
for (i = 0; i < nav.length; i++) preload(nav[i]);
	
	
function checkForm() {
	errors = "";
	if (document.forms[0].FirstName.value == "") errors = errors + "First Name is required.\n";
	if (document.forms[0].LastName.value == "") errors = errors + "Last Name is required.\n";
	if (document.forms[0].Title.value == "") errors = errors + "Title is required.\n";
	if (document.forms[0].Company.value == "") errors = errors + "Company is required.\n";
	if (document.forms[0].Address1.value == "") errors = errors + "Address is required.\n";
	if (document.forms[0].Phone.value == "") errors = errors + "Phone Number is required.\n";
	if (document.forms[0].email.value == "") errors = errors + "E-Mail Address is required.\n";
	if (errors != "") alert(errors);
	if (errors != "") return false;
}