var rand_no_str = rand_no.toString();
var arr = new Array();
arr[0] = rand_no_str.substr(0,1);
arr[1] = rand_no_str.substr(1,1);
arr[2] = rand_no_str.substr(2,1);
arr[3] = rand_no_str.substr(3,1);
arr[4] = rand_no_str.substr(4,1);

var carr = new Array();
var i=0;
for (i=0;i<=5;i++)
{
switch (arr[i])
{
case "0": carr[i] = '<img src="images/zero.gif">'
break;
case "1": carr[i] = '<img src="images/one.gif">'
break;
case "2": carr[i] = '<img src="images/two.gif">'
break;
case "3": carr[i] = '<img src="images/three.gif">'
break;
case "4": carr[i] = '<img src="images/four.gif">'
break;
case "5": carr[i] = '<img src="images/five.gif">'
break;
case "6": carr[i] = '<img src="images/six.gif">'
break;
case "7": carr[i] = '<img src="images/seven.gif">'
break;
case "8": carr[i] = '<img src="images/eight.gif">'
break;
case "9": carr[i] = '<img src="images/nine.gif">'
break;
}
};	
//document.write('<font color="#0000FF">' + carr[0] + '</font>bch<font color="#0000FF">' + carr[1] + '</font>cvd<font color="#0000FF">' + carr[2] + '</font>hty<font color="#0000FF">' + carr[3] + '</font>yys<font color="#0000FF">' + carr[4]);
document.write(carr[0] + carr[1] + carr[2] + carr[3] + carr[4]);