if (document.images) 
		{
		var abo_on = new Image(); abo_on.src =  'images/home/btn_abo_on.gif';
		var abo_off = new Image();abo_off.src = 'images/home/btn_abo_off.gif';
		var cli_on = new Image(); cli_on.src =  'images/home/btn_cli_on.gif';
		var cli_off = new Image();cli_off.src = 'images/home/btn_cli_off.gif';
		var con_on = new Image(); con_on.src =  'images/home/btn_con_on.gif';
		var con_off = new Image();con_off.src = 'images/home/btn_con_off.gif';
		var res_on = new Image(); res_on.src =  'images/home/btn_res_on.gif';
		var res_off = new Image();res_off.src = 'images/home/btn_res_off.gif';
		var wha_on = new Image(); wha_on.src =  'images/home/btn_wha_on.gif';
		var wha_off = new Image();wha_off.src = 'images/home/btn_wha_off.gif';
		}

	function imgOn(imgName) 
		{if (document.images){document[imgName].src = eval(imgName + "_on.src");}}
				
	function imgOff(imgName) 
		{if (document.images){document[imgName].src = eval(imgName + "_off.src");}}