need to reset an array using a function

<script language="javascript" type="text/javascript">
var Album = new Array();
var Price = new Array();
var Quantity = new Array();
function updateTextSelection(x){ 
 addBill(document.myForm.select.options[x].text,document.myForm.select.options[x].value,document.myForm.quantity.value);
 
 }
function addBill(item,cost,quant) {
 Album[Album.length] = item;
 Price[Price.length] = cost;
 Quantity[Quantity.length] = quant;
 
 var i;
 var orderString="";
 var bill=0;
 var tempPrice=0.00;
 for(i=0;i<Price.length;i++) {
   tempPrice=0.00;
   orderString = orderString + "Quantity :" + Quantity[i]+ '\t'+ Album[i] + ': \t £' + Price[i] + 'p \n';
 
   tempPrice = parseFloat(Price[i]) * Quantity[i]
   bill = bill+ parseFloat(tempPrice);
   }
   
 document.myForm.itemarea.value = orderString;
 
 document.myForm.totalCost.value = '£' + bill;
 
 calcTotal(document.myForm.quantity.value,bill);
 
 //document.myForm.quantity.value =""
}
 
function calcTotal(quantity,bill) {
    if ((isNaN(quantity)))  {
   
   alert('Please select a quantity for item');
  }
   else {
     if (quantity<1 || quantity>5) {
      alert('Ticket quantity should be between 1 and 5');
      }
      else {
      var total = '£'+ bill;
     document.myForm.totalCost.value =total;
      }
   }
}    
function reset(){ 
 //self.focus()
 Quantity=new Array();
 Price = new Array();
 Album = new Array();
 for (var i=1;i<=length;i++){
 document.myForm.Quantity.value = ""
 document.myForm.Album.value = ""
 document.myForm.Price.value = ""
 }
}
</script>