if (document.images) {            
            but1on = new Image();      
            but1on.src = "/_Image/serv_form_over.gif"; 
            but2on = new Image(); 
            but2on.src = "/_Image/serv_link_over.gif";  
            but3on = new Image();
            but3on.src = "/_Image/serv_info_over.gif";
			but4on = new Image();
            but4on.src = "/_Image/serv_cens_over.gif";
            

            but1off = new Image(); 
            but1off.src = "/_Image/serv_form.gif"; 
            but2off = new Image();          
            but2off.src = "/_Image/serv_link.gif"; 
            but3off = new Image();
            but3off.src = "/_Image/serv_info.gif";
			but4off = new Image();
            but4off.src = "/_Image/serv_cens.gif";
            
        }


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


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