Help Urgently need help, Galaxy Ace MeMoRy issue!

Hey Guys i am using Galaxy ACE, daily i use to download some apps from MARKET, now my cell in working very slow, and when i checked in manage applications, i tried to move applications to SD Card but coud'nt do d same as the ICO was inactive/grey.
When i checked the phone memory only 9Mb was left free......
Please Help.........!!! :thinking:
How to transfer applications to SD Card & How to install Apps directly to SD Card..........:)