var in_image = new Image();
var out_image = new Image();

function preloadButtonImgs(base_img_name)
{
	if (document.images)
	{
		image1 = new Image();
		image1.src = base_img_name + "_nor.gif";
		image1.src = base_img_name + "_cur.gif";
		image1.src = base_img_name + "_hov.gif";
	}	
}

function doMouseIn(img_name)
{
	if (document.images)
	{
		document[img_name].src = in_image;
	}
}

function doMouseOut(img_name)
{
	if (document.images)
	{
		document[img_name].src = out_image;
	}
}

function setStyle(objId, style, value)
{
	document.getElementById(objId).style[style]= value;
}
function setClass(obj_id, class_name)
{
	document.getElementById(obj_id).className = class_name;
}