var WindowSize = Class.create({
    width: function()
    {
        var myWidth = 0;
        if (typeof(window.innerWidth) == 'number')
        {
            //Non-IE
            myWidth = window.innerWidth;
        }
        else if (document.documentElement && document.documentElement.clientWidth)
        {
            //IE 6+ in 'standards compliant mode'
            myWidth = document.documentElement.clientWidth;
        }
        else if (document.body && document.body.clientWidth)
        {
            //IE 4 compatible
            myWidth = document.body.clientWidth;
        }
        return myWidth;
    },
    height: function()
    {
        var myHeight = 0;
        if (typeof(window.innerHeight) == 'number')
        {
            //Non-IE
            myHeight = window.innerHeight;
        }
        else if (document.documentElement && document.documentElement.clientHeight)
        {
            //IE 6+ in 'standards compliant mode'
            myHeight = document.documentElement.clientHeight;
        }
        else if (document.body && document.body.clientHeight)
        {
            //IE 4 compatible
            myHeight = document.body.clientHeight;
        }
        return myHeight;
    }
});

window.onresize = function() {
	setBottomBackgroundSize('onresize');
};

function setBottomBackgroundSize(event) {
	var winSize = new WindowSize();
	var winHeight = (winSize.height()-518);
	var contentTableHeight = $('contenttable').getHeight();

	if (event == 'onresize') {
		$('bottombackground').style.height = (winSize.height()-378);
	}

	if (event == 'onload') {
		if (winSize.height() > contentTableHeight) {
			$('bottombackground').style.height = (winSize.height()-378);
		} else {
			$('bottombackground').style.height = (contentTableHeight-378);
		}
	} 
}

document.observe('dom:loaded',function() {
	setBottomBackgroundSize('onload');
	
});