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 preload(){
  MM_preloadImages('images/company_up.gif','images/company_over.gif','images/clients_over.gif','images/projects_over.gif','images/equipment_over.gif','images/casestudies_over.gif','images/login_over.gif')
}