AJAX初级聊天室代码

"inputs").onkeydown = function(e){
        if(document.all){
            var Keys = event.keyCode;    
        }else{
            var Keys = e.which;
        }
        //alert(Keys)
        if(Keys == "38"){
            preChat()
        }else if(Keys == "40"){
            nextChat()
        }else if(event.ctrlKey && Keys == "13"){
            doUsingPost()
        }else if(event.ctrlKey && Keys == "46"){
            clean()
        }
    }

}
setInterval("doUsingGet()",1000)


JS辅助文件:请保存为 images/display.js
程序代码
function overInput(a){
    getId("btn").style.border = "1px solid #54ce43"
    getId("inputs").style.border = "1px solid #54ce43"
    focs()
}
function outInput(a){
    getId("btn").style.border = "1px solid #AAA"
    getId("inputs").style.border = "1px solid #AAA"
    focs()
}
function overBtn(a){
    a.src = "images/hover.gif"
}
function outBtn(a){
    a.src = "/uploadfile/201307/10/6121291488.gif"
}
function lrover(a){
    a.style.backgroundColor = "#EEE"
}
function lrout(a){
    a.style.backgroundColor = "#FFF"    
}
function focs(){
    getName("inputs").focus();
}
function clean(){
    getName("inputs").value = ""
}
var chats = new Array()
var chatStart
function addChat(strChat){
    if(chats.length > 199){
        chats.shift()
    }
    chats.push(strChat)
    chatStart = chats.length
}
function preChat(){
    if(chatStart && chatStart >= 1){
        if(chatStart == 1){
            getName("inputs").value = chats[0]
            chatStart = 0.5
        }else{
            chatStart -= 1
            getName("inputs").value = chats