/*按钮之类的提交时disabled, 然后提交完成自动enable; 用在提交动作发生前, 如 onsubmit 中
用法举例： 参见本目录formfuncdemo.htm
*/
function vsbformfunc()
{
    var _this = this;
    _this.disableautoenable = function(o)
    {
        o.disabled=true;
        settimeout(function(){_this.enableoncomplete(o);}, 500);
    }
    
    _this.enableoncomplete = function(o)
    {
       if(window.document.readystate=='complete')
       {
          o.disabled = false;
       }
       else
       {
           settimeout(function(){_this.enableoncomplete(o);}, 500);
       }
    }        
};
function changebase64_util(namelist,formname)
{
    if(!!namelist && namelist.length>0)
    {
        for(var i=0;i<namelist.length;i++)
        {
            var realname = namelist[i];
            var tmpname = realname+"_temp"; 
            try{
                var tmpnameobj = eval("document."+formname+"."+tmpname);
                var nameobj  = eval("document."+formname+"."+realname)
                if(tmpnameobj &&nameobj) 
                {
                    nameobj.value=new  base64().encode(tmpnameobj.value);
                    new vsbformfunc().disableautoenable(tmpnameobj);
                }
             }catch (e){}
        }    
    }
    return true;
}