This is a code snipet, you have to integrate it into your own script.
E.g.
Code:
alias sel_w_1 "weapon_mp5navy;weapon_xm1014;weapon_m3;weapon_p90"
alias sel_w_2 "weapon_tmp;weapon_ak47;weapon_mac10;weapon_sg552"
alias sel_w_3 "weapon_m4a1;weapon_aug;weapon_scout;weapon_awp"
alias sel_w_4 "weapon_g3sg1;weapon_m249;weapon_ump45;weapon_sg550"
alias sel_w_5 "weapon_galil;weapon_famas"
alias priw_selected "topcolor 'primary weapon selected'; developer 1; topcolor; developer 0"
alias sel_prim "sel_w_1;sel_w_2;sel_w_3;sel_w_4;sel_w_5;priw_selected"
bind x sel_prim