function $(e) {return document.getElementById(e);}
document.getElementsByClassName = function(cl) {
    var retnode = [];
    var myclass = new RegExp('\\b'+cl+'\\b');
    var elem = this.getElementsByTagName('*');
    for (var i = 0; i < elem.length; i++) {
        var classes = elem[i].className;
        if (myclass.test(classes)) retnode.push(elem[i]);
    }
    return retnode;
}
var MyMar;
var speed = 1; 
var spec = 5; 
var ipath = '../images/';


$('gotop').onmouseover = function() {this.src = ipath + 'gotop2.gif'; MyMar=setInterval(gotop,speed);}
$('gotop').onmouseout = function() {this.src = ipath + 'gotop.gif'; clearInterval(MyMar);}
$('gobottom').onmouseover = function() {this.src = ipath + 'gobottom2.gif'; MyMar=setInterval(gobottom,speed);}
$('gobottom').onmouseout = function() {this.src = ipath + 'gobottom.gif'; clearInterval(MyMar);}
function gotop() {document.getElementById('showArea').scrollLeft-=spec}
function gobottom() {document.getElementById('showArea').scrollLeft+=spec}
function fn_ImgChange(para1){
	document.getElementById("main_img").src = para1;}