function changes()
{
var myA = new Array( );

for (var i = 1; i <=document.pub.len1.value; i++)
    {
     var t=eval("document.pub.pods"+i+".value");
     if(eval(document.pub.sel1.value)==eval(i)){var myA=t.split(",");}
    }
document.pub.sel2.options.length = 0;
for (var i = 0; i < myA.length; i++)
    {
     document.pub.sel2.options[i]=new Option(myA[i],eval(i));
    }
}