How to prevent reload with onclick without “#”?

Question

I wish to put some instructions with a link - onclick calling a script that display a simple alert box. If I did like this...

Má         


        

Answer 1

<a href="" onclick="return ajudaUpload()">tipos permitidos</a>

and then return false in your function:

function ajudaUpload()
{
  ...
  return false;
}