if (document.images) {
var Home_off=new Image(); Home_off.src="images/topNavHomeG.gif";
var Home_on=new Image(); Home_on.src="images/topNavHomeT.gif";

var About_off=new Image(); About_off.src="images/topNavAboutG.gif";
var About_on=new Image(); About_on.src="images/topNavAboutT.gif";

var Clients_off=new Image(); Clients_off.src="images/topNavClientsG.gif";
var Clients_on=new Image(); Clients_on.src="images/topNavClientsT.gif";

var Costs_off=new Image(); Costs_off.src="images/topNavCostsG.gif";
var Costs_on=new Image(); Costs_on.src="images/topNavCostsT.gif";

var Contact_off=new Image(); Contact_off.src="images/topNavContactG.gif";
var Contact_on=new Image(); Contact_on.src="images/topNavContactT.gif";
}

function imgOn(imgName) {
	if (document.images) {
        document[imgName].src = eval(imgName + "_on.src");
	}
}
			
function imgOff(imgName) {
    if (document.images) {
	    document[imgName].src = eval(imgName + "_off.src");
	}
}	

function Validate(contactForm) 
{
	if(contactForm.firstName.value == "")
	{
		alert("Please Enter Your First Name.");
		contactForm.firstName.focus();
		return (false);
	}
	if(contactForm.lastName.value == "")
	{
		alert("Please Enter Your Last Name.");
		contactForm.lastName.focus();
		return (false);
	}	
	tmp = contactForm.email.value;
	var indDot = tmp.lastIndexOf(".");
	var indAt = tmp.indexOf("@");
	var space = tmp.indexOf(" ");
	var semi = tmp.indexOf(";");
	var tick = tmp.indexOf("`");
	var quote = tmp.indexOf("\"");

	if((indDot <= 0) || (indAt <= 0) || (space > 0) || (semi > 0) || (tick > 0) || (quote > 0) || ((indDot - indAt) <= 1) || (indDot == (tmp.length - 1))){
		alert("The Email address you have entered is not valid. Please fix the one you have entered or enter a new address."); 
		contactForm.email.focus();
		return (false);
	}
	if(contactForm.phone.value == "")
	{
		alert("Please Enter Your Phone Number.");
		contactForm.phone.focus();
		return (false);
	}
}