function addClass(node, cl) {
var Tcl = (node.className=="" ? new Array(0) : node.className.split(/\s+/));
Tcl.push(cl);
node.className = Tcl.join(" ");
}
function supprClass(node, cl) {
var reg = new RegExp(" "+cl+" ", "i");
var tmp = (" "+node.className+" ").replace(reg, " ");
node.className = tmp.substr(1, tmp.length-2);
}