Delay in open GL


I am new to the open GL.i am facing problem in implementing delay.I am using open GL ES 1.0. What i am trying to do is to scale up an image and wait for few seconds and bring it to back to original one.But it is waiting for some time and doing both scale up and down simultaneously.Please help me in solving this .I used two for loops for implementing delay.Is there any function for delay or sleep in open GL ES 1.0.

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