function f_over(fldname)
{
    img = document.getElementById(fldname);
    img.src = 'images/'+fldname+'_over.gif';
}

function f_out(fldname)
{
    img = document.getElementById(fldname);
    img.src = 'images/'+fldname+'.gif';
}

p1 = new Image(); p1.src = "images/featured_development_over.gif";
p2 = new Image(); p2.src = "images/featured_security_over.gif";
p3 = new Image(); p3.src = "images/featured_enterprise_over.gif";
p4 = new Image(); p4.src = "images/featured_optimization_over.gif";