function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
	var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
	if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function moveover()
{
document.getElementById('image').src="images/sales-center-button.png";
}
function moveback()
{
document.getElementById('image').src="images/sales-center2-button.png";
}
 
function moveover1()
{
document.getElementById('image1').src="images/outdoor-ad-button.png";
}
function moveback1()
{
document.getElementById('image1').src="images/outdoor-ad2-button.png";
}

function moveover2()
{
document.getElementById('image2').src="images/marketline-store-button.png";
}
function moveback2()
{
document.getElementById('image2').src="images/marketline-store2-button.png";
}

function moveover3()
{
document.getElementById('image3').src="images/urban-design-button.png";
}
function moveback3()
{
document.getElementById('image3').src="images/urban-design2-button.png";
}

function moveover4()
{
document.getElementById('image4').src="images/top-ten-button.png";
}
function moveback4()
{
document.getElementById('image4').src="images/top-ten2-button.png";
}