Hey peeps, well I am at my wits end with the dammed game

I have played it before and got further than i am now...you see my memory card decided to fuck up and I lost my game so after a few months of debating weather or not to play it again (I was disapointed when I lost over 90 hours of game play off my memory card) I am now stuck
I hope you guys know the story as my post will be patchy...ok..I am on disk 2, Cleyra has just been distroyed and Lindbum (sp?) has also been attacked. I am on the mist continent with Vivi, Zidane and Dagger (all around level 20 or so at the moment).....Doctor Tot has informed us to go to Qu's marsh (the one not far from the chocobo forest)..I cannot get back into Lindbum...I cannot get into South gate...I can pass across the continent thro Gizamamlukes Gotto but that is as far as I can go on the word map as I have yet to get the airship....still with me?.....Righto

Now I have been told by Quan (in the marsh hut thingy) that the entrance to the excavations may be hidden in the brush in the marsh area...I have been all over the marsh and cannot find it at all...I have found Quinna but al she says to me is 'hungry...frogs', there is a bridge over the pond in the marsh where Quinna is wandering about and on the opposite side of it in the top left there is a path that goes to a ledge..but no further...I cannot find the entrance to the site and I think this is where I am supposed to aquire Quinna (not sure tho).has anyone got any ideas as to what the fuck I am supposed to be doing here? Have I missed something earlier in the game? and if so how do I get back to it?
On the other side of the mist continent...where I can no longer get to there is a place salled Quans dwelling..I wnet there with dagger earlier in the game but nothing came of it..is this connected and should I have gone there with Zidane and Vivi?..if so how do I get back to it?
I am sorry this is so long but it is really infuriating me and there is nothing to put you off continuing a game like getting totally stuck in the middle of it.
Please please please help

My playstaion is standing by to try any suggestions that any of you may have.
Love and hugs to everyone who helps or even bothers reading this...Jenni***