simg=new Array(11);

simg[0]="images/top_header00.jpg";

simg[1]="images/top_header01.jpg";

simg[2]="images/top_header02.jpg";

simg[3]="images/top_header03.jpg";

simg[4]="images/top_header04.jpg";

simg[5]="images/top_header05.jpg";

simg[6]="images/top_header06.jpg";

simg[7]="images/top_header07.jpg";

simg[8]="images/top_header08.jpg";

simg[9]="images/top_header09.jpg";

simg[10]="images/top_header10.jpg";

Myimg=Math.floor(11*Math.random());

document.write("<center><img src='"+simg[Myimg]+"'></center>");