HTTP Re-Direct uri replace?

Thanks Brian i'm getting the following error:

line 3: [wrong args] [set wininsert string trimleft [HTTP::uri] 4]

line 7: [wrong args] [set talkinsert string trimleft [HTTP::uri] 5]

line 11: [wrong args] [set findinsert string trimleft [HTTP::uri] 5]

when HTTP_REQUEST {
    if { [HTTP::uri] starts_with "/win"  } {
        set wininsert string trimleft [HTTP::uri] 4
        HTTP::redirect "http://www.new.com/New-Advice$wininsert"
    }
    elseif { [HTTP::uri] starts_with "/talk"  } {
        set talkinsert string trimleft [HTTP::uri] 5
        HTTP::redirect "http://www.new.com/New-Advice$talkinsert"  
    }
     elseif { [HTTP::uri] starts_with "/find"  } {
        set findinsert string trimleft [HTTP::uri] 5
        HTTP::redirect "http://www.new.com/New-Advice$findinsert"   
    }
    else {
         pool STAGE_www.new.com-80 
    }  
}