function randomair_treatment()
{
number = Math.floor(Math.random()*3)
if (number==0)
document.write('<img src="img-randomiplay1.jpg" />')
if (number==1)
document.write('<img src="img-randomiplay2.jpg" />')
if (number==2)
document.write('<img src="img-randomiplay3.jpg" />')
}