var fDesc=new Array(); fDesc[0] = "Ray tracing is a set of algorithms for rendering scenes. It is known for producing high-quality images-and taking equally impressive amounts of time to do it in. However, since the early 1990s, computer graphics professionals have taken a new look at this rendering technology. Ever-improving microprocessors and algorithms may soon make ray tracing the rendering algorithm of choice for interactive computer graphics. Many movies already rely on this physical light simulation for special effects."; function tShowHide(id, show) { var s = document.getElementById("desc"); if ((s.innerHTML.length<=212 || show==1) && show!=2) { s.innerHTML = fDesc[id]; if (document.getElementById('m1')) document.getElementById('m1').style.display='none'; if (document.getElementById('m2')) document.getElementById('m2').style.display='none'; if (document.getElementById('more_txt')) document.getElementById('more_txt').style.display='inline'; } else { s.innerHTML = ''; } }