making control in user control visible=false on mouse over

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I have this datalist in a user control i want when i keep mouse over "开发者_如何学JAVAMore", it should be invisible. it is working on .aspx page not on user control. How to do this. This control is placed on master page.

Please Help.

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Probably it will be an issue with getElementById. In a naming container you cannot get the element by simply giving its id. You have to use ClientID to get the generated id of the element at runtime.

Something like

document.getElementById ( "<%= DataList2.ClientID %>");

See Control.ClientID Property

and

Control ID Naming in Content Pages

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I would agree that it's probably an issue with trying to get the id of the element since the element's id changes at runtime when you put it inside a user control. You can run your code then do a view source in the browser and see exactly what the id is generating to at runtime.

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Have you tried debugging the javascript mover() and mout() function? I am guessing you are looking for elements with the wrong id's since the id's are probably different inside a user control.