img1=new Image()
img1.src="http://www.smartfinancialservice.com/image/top_menu_company.jpg"; 
img2=new Image()
img2.src="http://www.smartfinancialservice.com/image/top_menu_services.jpg";
img3=new Image() 
img3.src="http://www.smartfinancialservice.com/image/top_menu_contactus.jpg";
img4=new Image() 
img4.src="http://www.smartfinancialservice.com/image/top_menu_resources.jpg";

function menu_onmouseover(id)
{
    document.getElementById(id).setAttribute('src','http://www.smartfinancialservice.com/image/top_menu_'+id+'_hover.jpg');
    //alert('image/top_'+id+'_hover.jpg');
}
function menu_onmouseout(id)
{
    document.getElementById(id).setAttribute('src','http://www.smartfinancialservice.com/image/top_menu_'+id+'.jpg');
}