xpath question

hi... in getting information on xpath/xml.. i thought i'd ask these lists as well... i'm trying to find out if there's a tool that i could use to load an HTML web page into, that would allow me to point to a given item/element within the Tree/DOM structure and allow me to see what the Xpath statement would be to generate that given itm/element of the Tree... i've seen a few tools but none that have exactly what i'm looking for... has anyone knowledge of any kind of tool/plugin like this? i'd also like to hear your comments pro/con of the tool if you've actually used it!! thanks -bruce