var imHome,imHomeAlt,imWhy,imWhyAlt,imWhyUs,imWhyUsAlt,imContact,imContactAlt;

function preloadImages(obj)
{
	
	if (obj=="home")
	{
		imHome = new Image(132,66);
		imHome.src = "images/btn_home_at.gif";
		imHomeAlt = new Image(132,66);
		imHomeAlt.src = "images/btn_home_at_no.gif";
	} else
	{	
		imHome = new Image(132,66);
		imHome.src = "images/btn_home.gif";
		imHomeAlt = new Image(132,66);
		imHomeAlt.src = "images/btn_home_hover.gif";
	}
	
	if (obj=="why")
	{
		imWhy = new Image(240,66);
		imWhy.src = "images/btn_why_at.gif";
		imWhyAlt   = new Image(240,66);
		imWhyAlt.src   = "images/btn_why_at_no.gif";
	} else
	{	

		imWhy = new Image(240,66);
		imWhy.src = "images/btn_why.gif";
		imWhyAlt   = new Image(240,66);
		imWhyAlt.src   = "images/btn_why_hover.gif";
	}

	if (obj=="whyus")
	{
		imWhyUs = new Image(240,66);
		imWhyUs.src = "images/btn_whyus_at.gif";
		imWhyUsAlt   = new Image(240,66);
		imWhyUsAlt.src   = "images/btn_whyus_at_no.gif";
	} else
	{	

		imWhyUs = new Image(240,66);
		imWhyUs.src = "images/btn_whyus.gif";
		imWhyUsAlt   = new Image(240,66);
		imWhyUsAlt.src   = "images/btn_whyus_hover.gif";
	}

	if (obj=="contact")
	{
		imContact = new Image(160,80);
		imContact.src = "images/btn_contact_at.gif";
		imContactAlt   = new Image(160,80);
		imContactAlt.src   = "images/btn_contact_at_no.gif";
	} else
	{	
		imContact = new Image(160,80);
		imContact.src = "images/btn_contact.gif";
		imContactAlt   = new Image(160,80);
		imContactAlt.src   = "images/btn_contact_hover.gif";
	}
}
<!-- 


function restoreImage() 
{
	var i,x,a=document.MM_sr;
	for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function findObject(n, d)
{
	var p,i,x;
	if(!d) d=document;
	if((p=n.indexOf("?"))>0&&parent.frames.length)
	{
		d=parent.frames[n.substring(p+1)].document;
		n=n.substring(0,p);
	}
	if(!(x=d[n])&&d.all) x=d.all[n];
	for(i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
	for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=findObject(n,d.layers[i].document);
	if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function swapImage()
{
	var i,j=0,x,a=swapImage.arguments;
	document.MM_sr=new Array;
	for(i=0;i<(a.length-2);i+=3)
	if ((x=findObject(a[i]))!=null)
	{
		document.MM_sr[j++]=x;
		if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];
	}
}
function openWindow(theURL,winName,features)
{
	window.open(theURL,winName,features);
}
 -->