Displaying the Accordion

Hi All,

There are Many Reports, But for Easy Understand i will consider only 2 reports mentioned below to explain my requirement

1)INFORMATION REPORT 2)BILLING REPORT

I have a dropdownlist of Reports, for each report i have a individual accordion.

Based on dropdownlist selection i made my reports(accordions)visible 
For Eg: In dropdownlist if i select INFORMATION REPORT then only that (accordion)Report is made visible, Now if i select the other report BILLING REPORT it should be displayed at the starting of the page i.e; Where the INFORMATION REPORT was displayed previously, But my BILLING REPORT is displayed at the Middle of the page, Like this if i select the third report it will be displayed leaving empty space of first and second report at the top and displayed below,Same with other remaining reports also....Like this i have 20 reports (accordions)

How to fix this requirement?

Examples With sample code is appreciated

Thank You,