My requirement is ..........
When user clicks on any input field to enter field value , a help content ( particular to that field ) is displayed on the right hand side of the page.

Ex : There is a field - Account No.
So when user clicks on the input field to enter account number, an interactive help is displayed. It says "Enter your 16 digit account number". Meaning this happens whenever the textbox gets the focus.

How can this be achieved?
I m planning to create a portlet which displays interactive help. But this would need to be hidden i.e. when there is no focus.Hiding a portlet is a bit difficult task.

Any idea?

Thanks in advance.