var textnumber = 7 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (textnumber-1) * randomnumber) + 1 ;
text = new Array;
text[1] = "home_mainbox1.jpg";
text[2] = "home_mainbox2.jpg";
text[3] = "home_mainbox3.jpg";
text[4] = "home_mainbox4.jpg";
text[5] = "home_mainbox5.jpg";
text[6] = "home_mainbox3.jpg";
text[7] = "home_mainbox4.jpg";

var homeimage = '<img src="images/'+text[rand1]+'" width="574" height="315" border="0" usemap="#Map">';