Problem installing virtualbox

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http://askubuntu.com – I'm using ubuntu 9.04. From last few days I'm trying to install a virtualbox,but i can't. I went to this link for virtualbox. https://www.virtualbox.org/wiki/Download_Old_Builds_3_0 Found the virtualbox for my version. After downloading it in xp i restarted my pc and opened ubuntu. While installing by package installer there is a problem. But the status giving a massage everytime I'm trying to install.it saying "Error: Dependency is not satisfiable: libcurl3 (>=7.16.2-1)". Here is an icon named "install package" but its hidden. I don't know what's the problem.I'm new to ubuntu,pls try to help (HowTos)