function preread(k){
		r = r-1;
		if (r==0) {
			r = 9;
		}	
		for (var i = 0; i<=9; i++) {
			if (i == r) {
				document.getElementById("imgChange_"+(i+1)).style.display = "block"
			}
			else {
				document.getElementById("imgChange_"+(i+1)).style.display = "none";
			}
		}
	}

	function nextread(k){
		if(r==9) {
			r=0;
		}	
		r = r+1;
		for (var j=0; j<=9;j++) {
			if (j == r) {
				document.getElementById("imgChange_"+(j+1)).style.display = "block";
			} else {
				document.getElementById("imgChange_"+(j+1)).style.display = "none";
			}
		}
	}

	function CurSorType(item) {
		document.getElementById("cck").className = item;
		document.getElementById("ccb").className  = item;
	}