function  show_arrow(id_left, id_right)
{
	var left_arrow = eval('document.getElementById("'+id_left+'")');
	var right_arrow = eval('document.getElementById("'+id_right+'")');

	left_arrow.src = 'images/arrow_left.gif';
	right_arrow.src = 'images/arrow_right.gif';
}

function  hide_arrow(id_left, id_right)
{
	var left_arrow = eval('document.getElementById("'+id_left+'")');
	var right_arrow = eval('document.getElementById("'+id_right+'")');

	left_arrow.src = 'images/black_box.jpg';
	right_arrow.src = 'images/black_box.jpg';
}


function getPixelsFromTop(obj)
{
	objFromTop = obj.offsetTop;
	while(obj.offsetParent!=null) {
		objParent = obj.offsetParent;
		objFromTop += objParent.offsetTop;
		obj = objParent;
	}
	return objFromTop;
}


function getTDHeight()
{
	var contentTopDiv = document.getElementById("content_top");
	var contentBotDiv = document.getElementById("content_bottom");
	var contentTop = getPixelsFromTop(contentTopDiv);
	var contentBottom = getPixelsFromTop(contentBotDiv);
	var contentHeight = contentBottom - contentTop;
	//alert("The cell height is " + contentHeight);

	var contentTopDiv2 = document.getElementById("content_top_left");
	var contentBotDiv2 = document.getElementById("content_bottom_left");
	var contentTop2 = getPixelsFromTop(contentTopDiv2);
	var contentBottom2 = getPixelsFromTop(contentBotDiv2);
	var contentHeightLeft = contentBottom2 - contentTop2;

	var left_td = document.getElementById("left_td_id");
	
	//left_td.height = contentHeight - contentHeightLeft - 125;
	if(navigator.appName == "Netscape")
	{
		left_td.height = contentHeight - contentHeightLeft - 85;
	}
	else
	{
		left_td.height = contentHeight - contentHeightLeft - 86;
	}
}