ringtones and text tone sony ericsson x10

hello i am new to the x10 and the forums i will try and explain as best i can with what i need help with.
i have been able to connect my sony ericsson x10 with my computer and download some songs which go to the mediascap file from here i can only set the songs for a ring tone. if i try and go into my phonebook to set a ring tone for a contact it will only bring up the tones that are already built into the phone not the ones i have downloaded.
this also applies with the text tones menu the songs i have downlaoded are all .mp3 format
do i need a different format or i have i put them into the wrong file.
thankyou for your time

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