This paper will focus on issues relating to the building of multimedia presentations under a certain framework through a newly developed e-learning tool. The issues addressed include the theoretical principles upon which the tool is based, the effective and appropriate use of multimedia and the format of presentation delivery. JavaAssisted SMIL (abbr. JAS) authoring tool is an advanced education supporting tool that ensures the maximum flexibility and deliverability for building multimedia presentation in an e-learning system. A presentation author can create his/her own streaming video along with the PowerPoint slideshows and other useful information through JAS. It simplifies the way to access latest SMIL technique and the outputs of an e-learning system.