HTML5 URL (clicktag) with variables

Question

I would like to use HTML5 banners in my company,

I have implemented this script with dynamic variables (I use this URL for flash\gif banners):

stage.setFlashVars("
    clickTAG=http://www.avatrade.com/lp/bonus100-button?tag=_ADPLDCP(Tag:)_
    &tag2=_ADPLDCP(ws_name:)_-EN-100bonusF15-_ADPLDCP(pl_size:)_-100bonusF15-B-_ADPLDCP(Page:)_-");

But when I click the banner I get this URL:

http://www.avatrade.com/lp/bonus100-button?tag=_ADPLDCP(Tag:)_

Do you have any idea why I loose the variables after the character "&"?