JavaScript img src based on function variable -

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i trying src of image based on sky+gatmap()+.jpg src supposed sky#.jpg # value of getmap(). having trouble quotation or something, doing wrong here?

<script type="text/javascript">     document.write("<img id='sky' src='sky+mapnum()+.jpg' alt='' />");   </script>

this case problem out of javaxcript book. doesn't tell me how this.

<script type="text/javascript">   document.write("<img id='sky' src='sky"+mapnum()+".jpg' alt='' />"); </script>

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