Javascript not working in Mac IE 5

We have a page that works great in the newer browsers on pc (IE, Firefox) but on Mac IE 5 the dropdown menus are not populated after you make your first selection.

Does anyone have any ideas if there is a fix or if the IE5 mac version just doesn't support javascript?

URL is: Mac IE 5 link

Javascript file in .js file:

Code:

---

//in order for this .js file to opperate properly it must be called after the combobox element in the form
//since if called before combo will have no items.

//get the number of items in the dropdown usport and store in groups variable
var groups=document.forms['application'].usport.options.length;

//take new variable and make a new array with that number of elements
var group=new Array(groups);

//loop the number of countries in combo and create arrays withing arrays
for (i=0; i<groups; i++){
 group[i]=new Array();
}

//again creat array within array for weekgroup
var weekgroup=new Array(groups);
for (i=0; i<groups; i++){
        weekgroup[i]=new Array();
}

//This section populates the 2 main arrays with sub arrays
//program
  //Dates
  group[0][0]=new Option("","");
  group[0][1]=new Option("Date not listed","1/1/1970");

  //Weeks
  weekgroup[0][0]=new Option("","");
  weekgroup[0][1]=new Option("Date not listed","");

//Football
  //Team list
  group[1][0]=new Option("","");
  group[1][1]=new Option("Bengals","Bengals");
  group[1][2]=new Option("Bills","Bills");
  group[1][3]=new Option("Broncos","Broncos");
  group[1][4]=new Option("Packers","Packers");
  group[1][5]=new Option("Vikings","Vikings");
 
  //Other
  weekgroup[1][0]=new Option("","")
  weekgroup[1][1]=new Option("Offense","O");
  weekgroup[1][2]=new Option("Defense","D");
 

 //Basketball
  //Team List
  group[2][0]=new Option("","");
  group[2][1]=new Option("Boston Celtics","Celtics");
  group[2][2]=new Option("Chicago Bulls","Bulls");
  group[2][3]=new Option("Orlando Heat","Heat");
  group[2][4]=new Option("Los Angeles Lakers","Lakers");
   
  //Duration
  weekgroup[2][0]=new Option("","");
  weekgroup[2][1]=new Option("Offense","O");
  weekgroup[2][2]=new Option("Defense","D");


//Cycling
  //Team List
  group[3][0]=new Option("","");
  group[3][1]=new Option("Discovery Channel","Discovery");
  group[3][2]=new Option("CSC","CSC");
  group[3][3]=new Option("Lotto","Lotto");
   
  //Duration
  weekgroup[3][0]=new Option("","");
  weekgroup[3][1]=new Option("Climbing","Climbing");
  weekgroup[3][2]=new Option("Time Trialing","TT");

function redirect(x){
        var temp=document.application.uteam;

        for (m=temp.options.length-1;m>0;m--){
                temp.options[m]=null;
                for (i=0;i<group[x].length;i++){
                        temp.options[i]=new Option(group[x][i].text,group[x][i].value);
                }
        }
        temp.options[0].selected=true;

        var temp=document.application.uother;

        for (m=temp.options.length-1;m>0;m--){
                temp.options[m]=null;
                for (i=0;i<weekgroup[x].length;i++){
                temp.options[i]=new Option(weekgroup[x][i].text,weekgroup[x][i].value);
                }
                temp.options[0].selected=true;
        }
}

---