jQuery(document).ready(function($) {
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    $(".wp-colorbox-youtube").colorbox({iframe:true, width:"90%", height:"90%", maxWidth:640, maxHeight: 480});
    $(".wp-colorbox-vimeo").colorbox({iframe:true, width:"90%", height:"90%", maxWidth:640, maxHeight: 480});
    $(".wp-colorbox-iframe").colorbox({iframe:true, width:"80%", height:"80%"});
    $(".wp-colorbox-inline").colorbox({inline:true, width:"90%", maxWidth:640});
});