pass xsl variable into the javascript function

Hi  

this is my code below

<input type="button" value="Submit" name="btnFormAction" onclick="javascript: {ddwrt:GenFireServerEvent(concat('__commit;__redirect={ShowQuestion.aspx?Title=',$URL1,'&amp;Question='
,$NextQNumber,'&amp;Of=',$URL2,'&amp;Session=',$URL3,'}'))}" />

I wanted to add another javascript function and pass xsl varaible name(url1,url2,url3)

how do i do that?

Tanks i advance

nain1987