Works but error

<form action="#" method="post" name="categories">
<table width="100%" border="0" cellspacing="3" cellpadding="3">
  <tr>
	<td class="form_title" colspan="2"><span class="text_header">Add Product</span></td>
  </tr>
  <tr>
	<td class="reg_form_left"><span class="text_main"><strong>Category:</strong></span></td>
	<td class="body_text_area"><select class="input_box" name="cat" id="cat" onChange="updatesubcat(this.selectedIndex)">
	  <option selected value="0">Please Select</option>
	  <option value="8">Eyelash Tinting/Perming</option><option value="5">Face, Hand & Body Care</option><option value="1">French Clay & Accessories</option><option value="6">Hair Accessories</option><option value="9">Nails</option><option value="10">Pedicure</option><option value="2">Retail</option><option value="11">Salon Furniture</option><option value="3">Tanning</option><option value="4">Terry Towelling & Accessories</option>				</select></td>
  </tr>
  <tr>
	<td class="reg_form_left"><span class="text_main"><strong>Sub-Category:</strong></span></td>
	<td class="body_text_area"><select class="input_box" name="subcat" id="subcat">
	</select></td>
  </tr>
  <tr>
	<td class="reg_form_left"><span class="text_main"></span></td>
	<td class="body_text_area"><span class="text_main"><strong><input type="submit" value="Submit" name="submit" id="submit" class="submit_box" /></strong></span></td>
  </tr>
</table>
</form>


<script type="text/javascript">

	var catlist=document.categories.cat
	var subcatlist=document.categories.subcat
	
	var subcat=new Array()
	subcat[0]=[""]
	subcat[1]=["Aroma Indulgence Body Care|1","Balneotherapy Healing Bath Foams|2","Essential Oil Blends|3",]
	subcat[2]=["No Sub-Categories Available|0",]
	subcat[3]=["No Sub-Categories Available|0",]
	subcat[4]=["No Sub-Categories Available|0",]
	subcat[5]=["No Sub-Categories Available|0",]
	subcat[6]=["No Sub-Categories Available|0",]
	subcat[7]=["No Sub-Categories Available|0",]
	subcat[8]=["No Sub-Categories Available|0",]
	subcat[9]=["No Sub-Categories Available|0",]
	subcat[10]=["No Sub-Categories Available|0",]
	
	
	
	function updatesubcat(catgroup){				
		subcatlist.options.length=0					
		if(catgroup>0){					
			for(i=0; i<subcat[catgroup].length; i++)
			subcatlist.options[subcatlist.options.length]=new Option(subcat[catgroup][i].split("|")[0], subcat[catgroup][i].split("|")[1])					
		}				
	}
	
</script>