function ChangeBG() {
var nombre= Math.floor(Math.random() * 5)
if(nombre < 1)
{
document.body.background='../images/dinandbg0.jpg'
}
else if (nombre < 2)
{
document.body.background='../images/dinandbg1.jpg'
}
else if (nombre < 3)
{
document.body.background='../images/dinandbg2.jpg'
}
else if (nombre < 4)
{
document.body.background='../images/dinandbg3.jpg'
}
else
{
document.body.background='../images/dinandbg4.jpg'
}
}