$(document).ready(function(){	
	
	/* sys check */
	$("#h_left img").mouseover(function(){$(this).attr('src','images/moSystemCheck.png')})
	.mouseout(function(){$(this).attr('src','images/banSystemCheck.png')});
	
	/* install kit */
	$("#h_right a:first-child img").mouseover(function(){$(this).attr('src','images/moInstallKit.png')})
	.mouseout(function(){$(this).attr('src','images/banInstallKit.png')});
	
	/* contact us */
	$("#h_right a:last-child img").mouseover(function(){$(this).attr('src','images/moContactUs.png')})
	.mouseout(function(){$(this).attr('src','images/banContactUs.png')});
	
});//doc ready