for(a=1;a<=5;a++){
		eval('s'+a+'_on = new Image()');
		eval('s'+a+'_off = new Image()');
		eval('s'+a+'_on.src = "/img/board/sub0'+a+'_o.gif\"');
		eval('s'+a+'_off.src = "/img/board/sub0'+a+'.gif\"');
		}

		function changem1(num,tog){
		eval("document.s"+num+".src=s"+num+"_"+tog+".src");
		}