Javascript ad click forward.

Can some one help me how to insert javascript.
Site Will Load in 8 Seconds &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="{$_WEB_URL}">Skip This >></a>

When User Clicks a banner of clicksor or bidvertiser instead of Skip This and load the link.

When some one clicks on the banner to load the link that was added on to database {$_WEB_URL}.