function foto(){
text_array=new Array(
'<img src="150_100/acquista.gif" width="150" height="100">',
'<img src="150_100/visi.gif" width="150" height="100">',
'<img src="150_100/vendi.gif" width="150" height="100">'
);
var mynumber=Math.random();
mynumber=mynumber*
text_array.length;
mynumber=mynumber-.5;
mynumber=Math.round(mynumber);
document.write(
'<font-color="red" size="15px">' +text_array[mynumber])+'</font>'
}