[OpenLayers-Users] Remove rectangle from the map

[Iswaria]

Hi,

I have written the script to draw the rectangle. This is the link of my
code: http://pastebin.com/HNyT9CJF

But I want to remove the rectangle, (if any) before drawing the rectangle.

As of now, I can draw any number of rectangles over the map. But My
requirement is to draw only one rectangle and remove the rectangle drawn if
any before.

How to do it?

Thanks.
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