if(previouscount==1)
{
 document.write("<link rel='stylesheet' type='text/css' href='homepage.css'>");
}

if(previouscount==2)
{
 document.write("<link rel='stylesheet' type='text/css' href='homepage2.css'>");
}
if(previouscount==3)
{
 document.write("<link rel='stylesheet' type='text/css' href='homepage3.css'>");
}