I have both sets of fake eggs but everytime I try to make the switch all the drow instantly turn hostile. I have tried to be invisible or sancturaried or both with being hasted, but everytime everyone turn hostile and I am unable to complete the quest and get Phare and the matron mother killed. Please Help.

lol, thats what your suppost to do. If you grab the eggs from the egg room and scramble (pun intended) and dont worry everyone is suppost to be hostile

And the egg room is inside the templ of lloth right? Then how do I give the eggs to Phare when she is hostile and won't talk?

No, you keep the real eggs and give them both the fake eggs, but be warned you have to fight a daemon prince.

But how do I give them the fake eggs if they are hostile and won't talk to me?

err, well if you have the real eggs that you obtained from the egg room just run out of the city and go to aldon the dragon (sp?)

If you have TOB, then the old strategy of "sanctuaried cleric switches eggs" no longer works. Instead, get all of your NPCs crowded around the door to the chamber. Kill the egg guards after opening the doors (it's important that no one in your party is within view of anyone but the egg guards). Then you should be able to move your party away, send in someone sanctuaried with Phaere's eggs, swap 'em for the real ones, and then just stroll outpast the golems.