addLoadEvent(prepLinksForCheckmarks);

/* http://simon.incutio.com/archive/2004/05/26/addLoadEvent */
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

/* http://www.scottandrew.com/weblog/articles/cbs-events */
function addEvent(obj, evType, fn, useCapture){
  if (obj.addEventListener){
    obj.addEventListener(evType, fn, useCapture);
    return true;
  } else if (obj.attachEvent){
    var r = obj.attachEvent("on"+evType, fn);
    return r;
  } else {
    //alert("Handler could not be attached: no support for addEventListener or attachEvent");
  }
}

function prepLinksForCheckmarks() {
	/* this function ensures that, when a link to an anchor
	   on the current page is visited, the visited style is
	   applied immediately, rather than on page reload */
	var anchors = document.body.getElementsByTagName("a");
	var anchor;
	for (var i = 0; i < anchors.length; i++) {
		anchor = anchors[i];
		addEvent(anchor, 'click', linkVisited, false);
	}
}

function linkVisited(evt) {
	this.className = "visited";
}

/* based on pausecomp() from http://www.sean.co.uk/a/webdesign/javascriptdelay.shtm */
function pause(waitMillis) {
	d = new Date() //today's date
	while (1) {
		mill=new Date() // Date Now
		diff = mill-d //difference in milliseconds
		if( diff > waitMillis ) {break;}
	}
}


/* ------- http://www.alistapart.com/d/stripedtables --------- */

// 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] : "#eee";
	
	// 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;
	  }
	}
}

// http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&selm=3D5ACF27.8040103%40equals.nospam.net&rnum=1
function hideColumn(theTable, col_number) {
    for (i = 0; i < theTable.rows.length; i++) {
     theTable.rows[i].cells[col_number - 1].style.display = "none";
   }
}

function showColumn(theTable, col_number) {
	for (i = 0; i < theTable.rows.length; i++) {
	 theTable.rows[i].cells[col_number - 1].style.display = "";
	}
}