How do they do this?

If you go to this site: http://www.agentappeal.com and then click on agent signup or login, there is a link in the upper right hand corner of the page that turns orange and then fades out. It is eye-catching for someone using the site and I am trying to figure out how they do this. I have sent a message to them asking how they do it but they will not reply.

Anyone know how to do this ?

 

They are using prototype/scriptaculous javascript for this effects.

I would use jQuery for this effect

I do not know prototype/scriptaculous js library

Their code.

<!--

function OnBaseBodyLoad()
{
try {
new Effect.Highlight('agenttag', { startcolor: '#FF6600', endcolor: '#ffffff' });
} catch (e){}
try {
 if (Object.isFunction(OnBodyLoad))
 {
 OnBodyLoad();
 }
 } catch (e){}
}

Code (markup):

The div id is agenttag.