var eimagenumber = 6 ;
var erandomnumber = Math.random() ;
var erand1 = Math.round( (eimagenumber-1) * erandomnumber) + 1 ;
eimages = new Array ;
eimages[1] = "EPOrandom/Model_Universe_small.JPG" ;
eimages[2] = "EPOrandom/Night_1_small.JPG" ;
eimages[3] = "EPOrandom/OCC_3_small.JPG" ;
eimages[4] = "EPOrandom/Activity_3_small.JPG" ;
eimages[5] = "EPOrandom/Students_Astronaut_small.JPG" ;
eimages[6] = "EPOrandom/Students_Sunspotter_small.JPG" ;

var eimage = eimages[erand1] ;