Por favor me gustaria que me ayudaran con una duda que tengo es sobre como deshabilitar item de un menu por ejemplo tengo este menu
Código HTML :
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script type="text/javascript" src="stmenu.js"></script><a href="http://www.dhtml-menu-builder.com" style="display:none;visibility:hidden;">Javascript DHTML Drop Down Menu Powered by dhtml-menu-builder.com</a>
<script type="text/javascript">
<!--
stm_bm(["menu6b66",900,"","blank.gif",0,"","",0,0,250,0,1000,1,0,0,"","",0,0,1,2,"default","hand","",1,25],this);
stm_bp("p0",[0,4,0,0,2,3,0,7,100,"",-2,"",-2,50,0,0,"#999999","#E6EFF9","",3,1,1,"#000000"]);
stm_ai("p0i0",[0,"Principal","","",-1,-1,0,"","_self","","","","",0,0,0,"arrow_r.gif","arrow_r.gif",7,7,0,0,1,"#E6EFF9",0,"#FFD602",0,"","",3,3,1,1,"#E6EFF9","#000000","#000000","#000000","8pt Verdana","8pt Verdana",0,0,"","","","",0,0,0]);
stm_bpx("p1","p0",[1,4,0,0,2,3,0,0]);
stm_aix("p1i0","p0i0",[0,"Secundario","","",-1,-1,0,"","_self","","","","",0,0,0,"","",0,0]);
stm_ep();
stm_ep();
stm_em();
//-->
</script>
</head>
<body class="oneColElsCtr">
<form id="form1" name="form1" method="post" action="">
<label>
<input type="submit" name="miboton" id="miboton" value="Menu" />
</label>
</form>
</body>
</html>
El menu tiene un item llamado "Principal" y este tiene un subitem que se llama "Secundario" me gustaria que cuando se precione el boton "Menu" se deshabilite "Secundario"
Agradeceria mucho su ayuda ya que estoy empezando con esto y no lo entiendo mucho
