example for button onClick
Example: onclick a tag
<a href='http://www.google.com' onclick='return check()'>check</a>
<script type='text/javascript'>
function check() {
return false;
}
</script><a href='http://www.google.com' onclick='return check()'>check</a>
<script type='text/javascript'>
function check() {
return false;
}
</script>