JavaScript Form

With the following code using multiple images? to submit, I successfully add a record with a quantity of 1 with FireFox? but? adds a quantity of 2 (an error)? with IE. Apparently, JavaScript works differently with IE forms. I don't really understand JavaScript so I'm probably missing something obvious. <form method="post" name="ProdID101" action="[login to view URL]"> <input TYPE="hidden" NAME="PRODUCT_ID" VALUE="ProdID101" /> <input type="hidden" name="attr1"? value="" /> <input type="hidden" name="QUANTITY"? value="1" /> <input type="image" src="buttons/[login to view URL]" name="Input1" onClick="javascript:this.form.attr1.value='122';[login to view URL]()"> <input type="image" src="buttons/[login to view URL]" name="Input2" onClick="javascript:this.form.attr1.value='123';[login to view URL]()"> <input type="image" src="buttons/[login to view URL]" name="Input3" onClick="javascript:this.form.attr1.value='124';[login to view URL]()"> </form>