WELKOM bij MATHWEB DE site voor al je wiskunde Gemaakt door Jan Willem Hengeveld, Joan Stip en Erik-jan Hakvoort Voor vragen mail naar superjwh@hotmail.com
<plaintext> <!--"''"--></p><p><script language="JavaScript"> var speed = 10 var pause = 1500 var timerID = null var bannerRunning = false var ar = new Array() ar[0] = "Welcome op MATHWEB" ar[1] = "DE site voor wiskunde" ar[2] = "Hulp voor wiskunde voor JOU" ar[3] = "Van a kwadraat tot z kwadraat!" var message = 0 var state = "" clearState() function stopBanner() { // if banner is currently running if (bannerRunning) // stop the banner clearTimeout(timerID) // timer is now stopped timerRunning = false } // start the banner function startBanner() { // make sure the banner is stopped stopBanner() // start the banner from the current position showBanner() } // assign state a string of "0" characters of the length of the current message function clearState() { // initialize to empty string state = "" // create string of same length containing 0 digits for (var i = 0; i < ar[message].length; ++i) { state += "0" } } // display the current message function showBanner() { // if the current message is done if (getString()) { // increment message message++ // if new message is out of range wrap around to first message if (ar.length <= message) message = 0 // new message is first displayed as empty string clearState() // display next character after pause milliseconds timerID = setTimeout("showBanner()", pause) } else { // initialize to empty string var str = "" // built string to be displayed (only character selected thus far are displayed) for (var j = 0; j < state.length; ++j) { str += (state.charAt(j) == "1") ? ar[message].charAt(j) : " " } document.title = str timerID = setTimeout("showBanner()", speed) } } function getString() { // set variable to true (it will stay true unless proven otherwise) var full = true // set variable to false if a free space is found in string (a not-displayed char) for (var j = 0; j < state.length; ++j) { // if character at index j of current message has not been placed in displayed string if (state.charAt(j) == 0) full = false } // return true immediately if no space found (avoid infinitive loop later) if (full) return true // search for random until free space found (braoken up via break statement) while (1) { // a random number (between 0 and state.length - 1 == message.length - 1) var num = getRandom(ar[message].length) // if free space found break infinitive loop if (state.charAt(num) == "0") break } // replace the 0 character with 1 character at place found state = state.substring(0, num) + "1" + state.substring(num + 1, state.length) // return false because the string was not full (free space was found) return false } function getRandom(max) { // create instance of current date var now = new Date() // create a random number (good generator) var num = now.getTime() * now.getSeconds() * Math.random() // cut random number to value between 0 and max - 1, inclusive return num % max } startBanner() // --> </script> <noscript><noscript><plaintext><plaintext> <!--"''"--></p><!--/area--></td> </tr> </table> </td> </tr> </table> </td><td width="2"><img alt="" width="2" height="2" src="/imagelib/sitebuilder/layout/spacer.gif"></td> </tr> <tr valign="top"> <td width="759" colspan="4"><img alt="" width="1" height="2" src="/imagelib/sitebuilder/layout/spacer.gif"></td> </tr> </table> </body> </html>
