OK, don't get too down yet Kristie.. Florida weather is not favorable for launching in the summer and the early forecast is not great for Fri, with only slight improvement over the weekend..
Of course, they've gone into a launch day with 10% chance of favorable weather and gotten off.. and had 90% chance of favorable weather that hasn't panned out, so you never know.
I'd strongly advise you guys going to keep checking on
http://forum.nasaspaceflight.com It's a site that has SERIOUS inside info on the technical things especially.. several times they've announced a scrub nearly a half hour before even NASA PAO announced it or the news media.. they've got folks behind the scenes feeding them info.
Just scroll down to the "Atlantis" section and each launch attempt day they'll have a thread with nearly constant updates starting about the time they start pumping 532,000 gallons of liquid propelant into the External Tank.
And again.. have fun!