Select more categories with 1 click - Simple problem?

[Kok]

I'm trying to adjust the onclick:() function so it selects more categories from my database but it doesn't work out! Hopefully someone can help me with this problem:

Script original, only checks the first category:

<input type="checkbox" id="catbox" onclick="boxclick(this,'cat1')"/> 

I already tried more events in the onclick function, but this only works out for the first 2 events:

<input type="checkbox" id="catbox" onclick="boxclick(this,'cat1');boxclick(this,'cat2');boxclick(this,'cat3')"/> 

I also have tried this, but it doesn't work out:

<input type="checkbox" id="catbox" onclick="boxclick(this,'cat1','cat2',cat3')"/> 

Hopefully someone knows the answer!

[davie]

Hi
This is a javascript issue
see http://www.w3schools.com/jS/js_functions.asp about user defined
functions
Regards Davie