var ro_img;
var ro_img_src;

// change a roll over image
function ro(img, src)
{
	return do_ro(img, 'gf/images/' + src + '_ro.png');
	ro_img_src = img.src;
	ro_img = img;
	
	img.src = 'gf/images/' + src + '_ro.png';
	if (typeof(is_lte_ie6) != "undefined")
	{
		var src = img.src;
		img.style.width = img.width + "px";
		img.style.height = img.height + "px";
		img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale')";
		img.src = 'gf/images/spacer.gif';
	}
}

// revert roll over image
function roff(img, src)
{
	return do_ro(img, 'gf/images/' + src + '.png');
	ro_img.src = ro_img_src;
	if (typeof(is_lte_ie6) != "undefined")
	{
		
	}
}

// do roll over
function do_ro(img, src)
{
	img.src = src;
	if (typeof(is_lte_ie6) != "undefined")
	{
		var src = img.src;
		img.style.width = img.width + "px";
		img.style.height = img.height + "px";
		img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale')";
		img.src = 'gf/images/spacer.gif';
	}
}

// copy height from one div to another
function copy_div_height(src, dst)
{
	if (typeof(document.getElementById(src)) != "undefined" && typeof(document.getElementById(src)) != "undefined")
	{
		var src_height = document.getElementById(src).offsetHeight;
		var dst_height = document.getElementById(dst).offsetHeight;
		
		if (dst_height < src_height)
		{
			document.getElementById(dst).style.height = src_height + 'px';
		}
	}
}

// preload who, how, why buttons
if (document.images)
{
	imgc1 = new Image(176,26);imgc1.src='gf/images/global_nav/who_ro.png';
	imgc2 = new Image(176,26);imgc2.src='gf/images/global_nav/why_ro.png';
	imgc3 = new Image(176,26);imgc3.src='gf/images/global_nav/how_ro.png';
}