var sixboltArray =  new Array("('Select size','',true,true)",
      "('40 tooth')",
      "('41 tooth')",
      "('42 tooth')",
      "('43 tooth')");
   
    var yzArray =  new Array("('Select size','',true,true)",
      "('48 tooth')",
      "('49 tooth')",
      "('50 tooth')",
      "('51 tooth')");
   
    var hondaArray =  new Array("('Select size','',true,true)",
      "('48 tooth')",
      "('49 tooth')",
      "('50 tooth')",
      "('51 tooth')");
   
    var ktmArray =  new Array("('Select size','',true,true)",
      "('48 tooth')",
      "('49 tooth')",
      "('50 tooth')",
      "('51 tooth')");
    
    var ksArray =  new Array("('Select size','',true,true)",
      "('48 tooth')",
      "('49 tooth')",
      "('50 tooth')",
      "('51 tooth')");

     var fourboltArray =  new Array("('Select size','',true,true)",
      "('38 tooth')",
      "('40 tooth')",
      "('41 tooth')",
      "('42 tooth')",
      "('43 tooth')",
      "('44 tooth')",
      "('46 tooth')",
      "('48 tooth')",
      "('52 tooth')");
    
     var pp_billetArray =  new Array("('Select size','',true,true)",
      "('38 tooth')",
      "('39 tooth')",
      "('40 tooth')",
      "('41 tooth')",
      "('42 tooth')");
   
    
    function choosesize(inForm,selected) {
      var selectedArray = eval(selected + "Array");
      while (selectedArray.length < inForm.size.options.length) {
        inForm.size.options[(inForm.size.options.length - 1)] = null;
      }
      for (var i=0; i < selectedArray.length; i++) {
        eval("inForm.size.options[i]=" + "new Option" + selectedArray[i]);
      }
      if (inForm.bolt.options[0].value == '') {
        inForm.bolt.options[0]= null;
      }
    }
    
    function chooseColor(inForm,selectedsize) {  
      inForm.item_name.value = "test " + document.sprocket.size.selectedIndex
      teeth = selectedsize
      var colorArray =  new Array("('Select color','',true,true)",
        "('Black')",
        "('Silver')");
        for (var i=0; i < colorArray.length; i++) {
          eval("inForm.color.options[i]=" + "new Option" + colorArray[i]);
        }
    }

     
    function compute(inForm) { 
	teethArray = new Array (new Array("4 bolt 38t","4 bolt 40t","4 bolt 41t","4 bolt 42t","4 bolt 43t","4 bolt 44t","4 bolt 46t","4 bolt 48t","4 bolt 52t"),new Array("6 bolt 40t","6 bolt 41t","6 bolt 42t","6 bolt 43t"),new Array("YZ 48t","YZ 49t","YZ 50t","YZ 51t"),new Array("Honda 48t","Honda 49t","Honda 50t","Honda 51t"),new Array("KTM 48t","KTM 49t","KTM 50t","KTM 51t"),new Array("Kawasaki, Suzuki 48t","Kawasaki, Suzuki 49t","Kawasaki, Suzuki 50t","Kawasaki, Suzuki 51t"),new Array("Pitster Pro 38t","Pitster Pro 39t","Pitster Pro 40t","Pitster Pro 41t","Pitster Pro 42t")); 
   inForm.item_name.value=("Sprocket " + teethArray[inForm.bolt.selectedIndex] [inForm.size.selectedIndex -1]);
   }