You can use bool variable to do it.
here example:
PHP Code:
#include < amxmodx >
new bool:g_bDisabled[ 33 ];
public menu_example()
{
// menu code goes here..
new szItem[ 64 ];
formatex( szItem, charsmax( szItem ), "My Option [ %sabled ]", g_bDisabled[ id ] ? "Dis" : "En" );
menu_additem( menuid, szItem );
// crap ..
}
public sub_menu( id, menu, item )
{
if( item == /*item id*/ )
g_bDisabled[ id ] = !g_bDisabled[ id ];
}