function getElementsByClassName(className, type)
{
    var itemSrc = '';
    var els = document.getElementsByTagName(type); //Not supported by safari
    for ( var i = 0, j = els.length ; i < j ; i++ )
    {
        if (els.item(i).className.indexOf(className) != -1)
        {
            itemSrc = els.item(i).src;
            //These expando properties are used to store values against the element as the loop runs
            
            els[ i ].srcOn = itemSrc.substring(0,itemSrc.length-4) + '_on' + itemSrc.substring(itemSrc.length,itemSrc.length-4);
            els[ i ].srcOff = itemSrc
            
            els.item(i).onmouseover = function()
            {
                this.src = this.srcOn;
            }
            
            els.item(i).onmouseout = function()
            {
                this.src = this.srcOff;
            }
        }
    }
     
}

function attachEventHandlers()
{	
	getElementsByClassName( "swapbutton", "img" );
	
	getElementsByClassName( "swapbutton", "input" );  
}

function addEvent( obj, type, fn )
{
	if ( obj )
	{
		if (obj.addEventListener)
			obj.addEventListener( type, fn, false );
		else if (obj.attachEvent)
		{
			obj["e"+type+fn] = fn;
			obj[type+fn] = function() { obj["e"+type+fn]( window.event ); }
			obj.attachEvent( "on"+type, obj[type+fn] );
		}
	}
}

function removeEvent( obj, type, fn )
{
	if (obj.removeEventListener)
		obj.removeEventListener( type, fn, false );
	else if (obj.detachEvent)
	{
		obj.detachEvent( "on"+type, obj[type+fn] );
		obj[type+fn] = null;
		obj["e"+type+fn] = null;
	}
}

// Load in all the event on body load
addEvent( window, 'load', attachEventHandlers );