pic = new Array(2);
pic[0] ='http://persianboom.persiangig.com/Weblog/Themes/MainSkins/Images/Headers/Header01.jpg'
pic[1] ='http://persianboom.persiangig.com/Weblog/Themes/MainSkins/Images/Headers/Header01.jpg'
pic[2] ='http://persianboom.persiangig.com/Weblog/Themes/MainSkins/Images/Headers/Header01.jpg'
pic[3] ='http://persianboom.persiangig.com/Weblog/Themes/MainSkins/Images/Headers/Header01.jpg'

index = Math.floor(Math.random() * pic.length);