function nav()
{
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
document.write(" ")
}