I want to create tool tips for each part in a form which employees have to fill in a share point web page. When users move the mouse cursor on each field (Title, description, department etc.) the related tip will be automatically became visible as a simple pop-up (tool tip) and summarize what they should write there. and when the mouse cursor is not on one of these fields there is no tool tip.

How can I design such a system via share point designer? I am not able use any add ons. I can't upload any additional things to the server. I have to make page based design.

I would be glad if you kindly help me.