if(document.images) {
        
        var  home1 = new Image();
        var  home2 = new Image();
        var  contact1 = new Image();
        var  contact2 = new Image();
        var  toc1 = new Image();
        var  toc2 = new Image();
        var  aboutus1 = new Image();
        var  aboutus2 = new Image();
        var  projects1 = new Image();
        var  projects2 = new Image();
        var  awards1 = new Image();
        var  awards2 = new Image();
        var  employment1 = new Image();
        var  employment2 = new Image();
        var  links1 = new Image();
        var  links2 = new Image();
        var  moretruframe1 = new Image();
        var  moretruframe2 = new Image();

     home1.src = "../images/common/main_navon_home.gif";
     home2.src = "../images/common/main_navoff_home.gif";   
     contact1.src = "../images/common/main_navon_contact.gif";
     contact2.src = "../images/common/main_navoff_contact.gif";
     toc1.src = "../images/common/main_navon_toc.gif";
     toc2.src = "../images/common/main_navoff_toc.gif";
     aboutus1.src = "../images/common/main_navon_aboutus.gif";
     aboutus2.src = "../images/common/main_navoff_aboutus.gif";
     projects1.src = "../images/common/main_navon_projects.gif";
     projects2.src = "../images/common/main_navoff_projects.gif";
     awards1.src = "../images/common/main_navon_awards.gif";
     awards2.src = "../images/common/main_navoff_awards.gif";
     employment1.src = "../images/common/main_navon_employment.gif";
     employment2.src = "../images/common/main_navoff_employment.gif";
     links1.src = "../images/common/main_navon_links.gif";
     links2.src = "../images/common/main_navoff_links.gif";
     moretruframe1.src = "../images/projects_more_on.gif";
     moretruframe2.src = "../images/projects_more_off.gif";


}
function off(imgName) {
        if(document.images)
        document[imgName].src = eval(imgName + '1.src');
}
function on(imgName) {
        if(document.images)
        document[imgName].src = eval(imgName + '2.src');
}


function hiLite(imgDocID, imgObjName) {
    if (document.images) {
		document.images[imgDocID].src = eval(imgObjName + ".src");
	}
}