function preloader() 
{
     var i = 0;
     imageObj = new Image();
     images = new Array();     
	 images[0]="images/transport-service-hover.jpg"     
	 images[1]="images/transport-service-normal.jpg"     
	 images[2]="images/project-management-hover.jpg"     
	 images[3]="images/project-management-normal.jpg"
	 images[4]="images/procurement-hover.jpg"
	 images[5]="images/procurement-normal.jpg"
     
	 for(i=0; i<=5; i++)      
	 {          
	 	imageObj.src=images[i];     
	 }
} 

function mouseOver()
{
document.getElementById("b1").src="images/transport-service-hover.jpg";
}

function mouseOut()
{
document.getElementById("b1").src="images/transport-service-normal.jpg";
}

function projectnormal()
{
document.getElementById("b2").src="images/project-management-hover.jpg";
}

function projecthover()
{
document.getElementById("b2").src="images/project-management-normal.jpg";
}

function procurementnormal()
{
document.getElementById("b3").src="images/procurement-hover.jpg";
}

function procurementhover()
{
document.getElementById("b3").src="images/procurement-normal.jpg";
}