function trChangeBgColor()
{
	var	container = document.getElementById("resultado");
	
	if( container != null )
	{
		var lines = container.getElementsByTagName("tr");
		var i;
		
		if( lines != null )
		{
			for( i = 0; i < lines.length; i++ )
			{
				var obj = lines[i];
			
				if( obj.className == "item" )
				{
					obj.onmouseover = function()
					{
						this.className = "hover";
					}
					
					obj.onmouseout = function()
					{
						this.className = "item";
					}
				}
				
				if( obj.className == "alternating" )
				{
					obj.onmouseover = function()
					{
						this.className = "hover";
					}
					
					obj.onmouseout = function()
					{
						this.className = "alternating";
					}
				}
			}
		}
	}
}