// Hopkins Dance global .js file
// Written by Jeff Heidelberg
// Version 1.0		11/01/2004

// Table striping script courtesy of David F. Miller and A List Apart 173
// This includes the hasClass and stripe functions and implementations of
// those functions
//
// Table sorting script courtesy of Stuart Langridge

// 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
	// <tbody>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;
		}
	}
}