WYSIWYG Editor... edit a selected object.

Hello, I'am building a wysiwyg editor and I have trouble to detect an object like a TABLE, an IMAGE etc...
Example:
I've insert a TABLE in design mode and then I would like to select it and then edit its properties...
I found a method that works very well but it only with MSIE...
Is there anyone that can help me to do the same thing compatible with MOZILLA & Co. browsers ???

Here is my code...


if (this.myEditor.document.selection.type == 'Control')
{
var range = this.myEditor.document.selection.createRange();
// Check if one object is selected
if (range.length == 1 && (range(0).tagName == 'TABLE' || range(0).tagName == 'table'))
{
current_width=range(0).width;
current_height=range(0).height;
current_border=range(0).border;
current_bordercolor=range(0).borderColor;
current_cellspacing=range(0).cellSpacing;
current_cellpadding=range(0).cellPadding;
current_align=range(0).align;
current_bgcolor=range(0).bgColor;
alert (current_width);
// alert other variables to view...
return true;
}
}

Thanks for anyone who will try to help me...