Firefox equivalent for runtimeStyle? Help!

Hi all, I'm new to this forum and I hope anyone can help me solve this.

I'm improving a wysiwyg editor I found, and I wrote a script that makes the zero-border tables visible when in edit mode. It works fine in IE but the caveat here is that I can't get the script to work in Firefox b/c the runtimeStyle function doesn't work there.

The reason I'm using runtimeStyle and not just "style" is that the former doesn't mess with the in-line style of the element (in this case, the table).

Here's a snippet of the function:

 
  var tables = doc.getElementsByTagName("table"); 
  for(var i=0;i<tables.length;i++) {
   if ( tables[i].getAttribute("border") == 0 || tables[i].getAttribute("border") == null) {//begin if
      if (WYSIWYG_Core.isMSIE) {//if browser is IE
        tables[i].runtimeStyle.border = "1px dashed #cccccc";
         }else{//otherwise,
     (((some function that does the same thing in FF)))
      }
}

PHP:

So, Is out there a FF equivalent for runtimeStyle? If so, How can I use it?

Any suggestions are appreciated.
cheers!

 

Is there a way around this??

Thanks in advance.