javascript issues with firefox and Netscape are common, but my problem is unique..
I have a "Search" image in my page which calls a javascript function. The problem is that there is absolutely no response when I click the image.. None of the code executes, and the image behaves as if it is a text field. There is no problem if I use IE. It does not work in Netscape either.. Can anyone fix this problem?

<img src="images/buttons/search_orange.gif" width="45" height="22" alt="" border="0" onclick="null_check()"><script language="javascript">function null_check(){	var city_id=document.search_form.city_id;	var product=document.search_form.product;	if ((city_id.selectedIndex==0))	{		alert("Please Enter your City Name")		city_id.focus();				return false	}	if (search_form.product.value=="Product")	{		alert("Please Enter Product or Clear the field to continue with the search")		search_form.product.focus();		return false	}	search_form.action="HydBiz/search";	search_form.submit();}</script>

edited to make code more readable - Brad

[chucker]

I could be wrong, but doesn't the function have to be defined before it's called?

yes, in the code the function is defined before it's called.. I pasted the function code after the call so that the function call is clearly visible in the post.

[rollercoaster375]

search_form.action="HydBiz/search";search_form.submit();

I'm no JavaScript whiz, but shouldn't "document." be proceeding the "search_form"?