how to fix this bug?

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   this is some sample:
http://webwiz.net/wwf_forum/default.asp?c=2 (normal)
and i add this:
http://webwiz.net/wwf_forum/default.asp?c=2'  
or http://webwiz.net/wwf_forum/default.asp?c=a 
or http://webwiz.net/wwf_forum/post_message_form.asp?FID=1 (normal) 
http://webwiz.net/wwf_forum/post_message_form.asp?FID=1'  (it will error - easy to hack)

Microsoft VBScript runtime error '800a000d' 

Type mismatch: '[string: "2'"]' 
Type mismatch: '[string: "a"]' 
Type mismatch: '[string: "1'"]' 

yes, these are simple bug, but i cant fix cause i'm noob 
could you plz fix this? check and retrict load this bug 

this is my sample the page fixed it (before they got this bug too):
http://mobitechs.com/home/mobile.aspx?mobileid=44 (normal) and u add this: 
http://mobitechs.com/home/mobile.aspx?mobileid=44' 
or http://mobitechs.com/home/mobile.aspx?mobileid=a 

not problem, not error it only redirect to http://mobitechs.com/home/mobile.aspx 

thank for your support!