belkin WLAN wireless router HELP!

[allied641]

Ok... Whenever i play CS:CZ i ping around 60 but bout once every three rounds i get this lag which skyrockets my ping to 1,000-3,000 and it happens or about 7-10 seconds... which really wouldnt be bad on a big map... but all i play is scoutzknivez which means automatic death.. if there are any console commands, or a DL or anything i would grately appreciate it. thanks