// Main JavaScript

// MANGLE email addresses so spambots cannot harvest
// <BODY onLoad="mangle()">
// <span class="change">userid at phcc dot edu</span>
function mangle() {
  if (!document.getElementsByTagName && !document.createElement &&
    !document.createTextNode) return;
  var nodes = document.getElementsByTagName("span");
  for(var i=nodes.length-1;i>=0;i--) {
    if (nodes[i].className=="change") {
      var at = /at/;
      var dot = /dot/g;
      //var address = nodes[i].firstChild.nodeValue.split(" ").join("");
      var address = nodes[i].firstChild.nodeValue;
      var node = document.createElement("a");

      address = address.replace(" at ", "@");
      address = address.replace(" dot ", ".");
      address = address.replace(" dot ", ".");
      node.setAttribute("href", "mailto:"+address);
      node.appendChild(document.createTextNode(address));

      var parent = nodes[i].parentNode;
      for(var j=0;j<parent.childNodes.length;j++)
        if (parent.childNodes[j] == nodes[i]) {
          if (!parent.replaceChild) return;
          parent.replaceChild(node, parent.childNodes[j]);
          break;
        }
    }
  }
}


// Auto stripe tables from a list apart

// USAGE-Requires: 
		// <body onload="stripe('stripeit', '#fff', '#edf3fe');"> - in /t/main.html
		// <table id="stripeit" ... - in each striped table
		
// this function is needed to work around 
// a bug in IE related to element attributes
  function hasClass(obj) {
     var result = false;
     if (obj.getAttributeNode("class") != null) {
         result = obj.getAttributeNode("class").value;
     }
     return result;
  }   

 function stripe(id) {

    // the flag we'll use to keep track of 
    // whether the current row is odd or even
    var even = false;
  
    // if arguments are provided to specify the colours
    // of the even & odd rows, then use the them;
    // otherwise use the following defaults:
    var evenColor = arguments[1] ? arguments[1] : "#fff";
    var oddColor = arguments[2] ? arguments[2] : "#F2F2E6";
  
    // obtain a reference to the desired table
    // if no such table exists, abort
    var table = document.getElementById(id);
    if (! table) { return; }
    
    // by definition, tables can have more than one tbody
    // element, so we'll have to get the list of child
    // &lt;tbody&gt;s 
    var tbodies = table.getElementsByTagName("tbody");

    // and iterate through them...
    for (var h = 0; h < tbodies.length; h++) {
    
     // find all the &lt;tr&gt; elements... 
      var trs = tbodies[h].getElementsByTagName("tr");
      
      // ... and iterate through them
      for (var i = 0; i < trs.length; i++) {

        // avoid rows that have a class attribute
        // or backgroundColor style
        if (! hasClass(trs[i]) &&
            ! trs[i].style.backgroundColor) {
 		  
          // get all the cells in this row...
          var tds = trs[i].getElementsByTagName("td");
        
          // and iterate through them...
          for (var j = 0; j < tds.length; j++) {
        
            var mytd = tds[j];

            // avoid cells that have a class attribute
            // or backgroundColor style
            if (! hasClass(mytd) &&
                ! mytd.style.backgroundColor) {
        
              mytd.style.backgroundColor =
                even ? evenColor : oddColor;
            
            }
          }
        }
        // flip from odd to even, or vice-versa
        even =  ! even;
      }
    }
  }
  
  