if (document.images) {            
		toc1on = new Image();   toc1on.src = "images/buttons/strategic_marketing_over.gif";
		toc1off = new Image();  toc1off.src = "images/buttons/strategic_marketing_off.gif";

		toc2on = new Image();   toc2on.src = "images/buttons/principled_branding_over.gif";
		toc2off = new Image();  toc2off.src = "images/buttons/principled_branding_off.gif";

		toc3on = new Image();   toc3on.src = "images/buttons/writing_concepting_over.gif";
		toc3off = new Image();  toc3off.src = "images/buttons/writing_concepting_off.gif";

		toc4on = new Image();   toc4on.src = "images/buttons/public_relations_over.gif";
		toc4off = new Image();  toc4off.src = "images/buttons/public_relations_off.gif";

		toc5on = new Image();   toc5on.src = "images/buttons/about_over.gif";
		toc5off = new Image();  toc5off.src = "images/buttons/about_off.gif";

		toc6on = new Image();   toc6on.src = "images/buttons/contact_over.gif";
		toc6off = new Image();  toc6off.src = "images/buttons/contact_off.gif";

            }

    function img_act(imgName) {
            if (document.images) {
                document[imgName].src = eval(imgName + "on.src");       
            }
    }

    function img_inact(imgName) {
            if (document.images) {
                document[imgName].src = eval(imgName + "off.src");        
            }
    }