// single statig update:
// setup default
var changeDelay = 10000;
imgsrc = new Array(19);
imgtxt = new Array(19);
imgsrc[0] = "../img/trailer01.png";
imgtxt[0] = "Trailer Image";
imgsrc[1] = "../img/trailer02.png";
imgtxt[1] = "Trailer";
imgsrc[2] = "../img/trailer03.png";
imgtxt[2] = "Trailer";
imgsrc[3] = "../img/trailer04.png";
imgtxt[3] = "Trailer";
imgsrc[4] = "../img/trailer05.png";
imgtxt[4] = "Trailer";
imgsrc[5] = "../img/trailer06.png";
imgtxt[5] = "Trailer";
imgsrc[6] = "../img/trailer07.png";
imgtxt[6] = "Trailer";
imgsrc[7] = "../img/trailer08.png";
imgtxt[7] = "Trailer";
imgsrc[8] = "../img/trailer09.png";
imgtxt[8] = "Trailer";
imgsrc[9] = "../img/trailer10.png";
imgtxt[9] = "Trailer";
imgsrc[10] = "../img/trailer11.png";
imgtxt[10] = "GPU-based global illum: ring caustic";
imgsrc[11] = "../img/trailer12.png";
imgtxt[11] = "GPU-based global illum: cornell box";
imgsrc[12] = "../img/trailer13.png";
imgtxt[12] = "Higher Order Parallax Mapping";
imgsrc[13] = "../img/trailer14.png";
imgtxt[13] = "Software-based height field rendering on mobile devices";
imgsrc[14] = "../img/trailer15.png";
imgtxt[14] = "Artificial temperature visualization using volume rendering";
imgsrc[15] = "../img/trailer16.png";
imgtxt[15] = "Virtual and physical mirrors in AR/VR";
imgsrc[16] = "../img/trailer17.png";
imgtxt[16] = "GPU shaders in Maya for real-time preview";
imgsrc[17] = "../img/trailer18.png";
imgtxt[17] = "A custom PK4 viewer engine in DX9, rendering a Doom3 level";
imgsrc[18] = "../img/trailer19.png";
imgtxt[18] = "Stuttgart's city model rendered interactively on a PDA";

function changeTrailerImg()
{
    imgIdx = Math.floor(Math.random() * imgsrc.length);
    parent.navFrame.document.images['Trailer'].src = imgsrc[imgIdx];
    parent.navFrame.document.images['Trailer'].alt = imgtxt[imgIdx];
    
    window.setTimeout("changeTrailerImg()", changeDelay);
}

function rndTrailerImg(delay)
{
    changeDelay = delay;
    changeTrailerImg();
}