VISTA, Calif. -- A 19-year-old Los Angeles man, who allegedly molested a 13-year-old Oceanside girl he met through the Internet Web site MySpace.com, pleaded not guilty Monday to four counts of lewd acts upon a child.

Vista Superior Court Judge Aaron Katz ordered Luis Freddy Alvarado to remain jailed in lieu of $250,000 bail pending a bail review Thursday.

Alvarado allegedly communicated with the victim on the social networking site, which is popular with teens, several times before traveling to Oceanside and assaulting the girl March 12.

Attached to the charges are allegations that Alvarado caused bodily injury, used force or violence, befriended the alleged victim of purposes of committing a felony and engaged in substantial sexual conduct.

Detectives armed with warrants searched the home and vehicle of the defendant, a Hollywood High School student, seized a computer and other items, Oceanside police Sgt. Leonard Mata said last week.

MySpace.com is a free online social networking site in which millions of members set up Web pages and communicate in chat rooms.