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Advance Search Ui GuideLine

i have to create a ui for searching Opportunity . user fullfill the criteria and he will get the opportunity List accordingly  what i was thinking create a inputTextField when user enters any character then it will show result on keyup event .and one more section for Advance search in which there are various filter based on different Fields for Opportunity i am thinking of creating a PageBlock  and in that i will put select list or other visualforce component but the problem is by default pageblock is  in expand mode i want to show it in collapse mode initially when page renders so that user will click on the pageblock and then it expands how to accomplsih this and any other suggestion are welcomed please suggest ??