(function(){
var tabArr = ["tab_menu01","tab_menu03","tab_menu04","tab_menu05"];
var contentArr = ["tab_content01","tab_content03","tab_content04","tab_content05"];
var init = function(){
    for(var i = 0 ; i < tabArr.length ;i++ ){
        document.getElementById(tabArr[i]).onclick = clickHandler;
        document.getElementById(contentArr[i]).style.display = "none";
    }
    document.getElementById(tabArr[0]).className="on";
    document.getElementById(contentArr[0]).style.display = "block";
};
var clickHandler = function(e){
    if(window.event){obj = window.event.srcElement;}
    else{obj = e.target;}
    for(var i = 0 ; i < tabArr.length ;i++ ){
        document.getElementById(tabArr[i]).className="";
        document.getElementById(contentArr[i]).style.display = "none";
    }
    document.getElementById(obj.id).className="on";
    document.getElementById( "tab_content" + obj.id.split("tab_menu")[1] ).style.display = "block";
    return false;
}
init();
})();