var expandAllClosed = true;

function xPand(param){
            
    var clickClass = param.className;
    var parentClass = param.parentNode.className;
    var clickId = param.id;
    var parentId = param.parentNode.id;
    
    if(expandAllClosed){
        
        // lde = loop div elements
        var lde = document.getElementsByTagName('div');
            
        for (var i = 0; i<lde.length;i++){
            if(lde[i].className == parentClass + "_a"){
                lde[i].className = parentClass;
            }
        }
    }    
    
    if(parentClass.indexOf("_a") == -1){
        parentClass += "_a";        
    } else {
        var parentClassNum = parentClass.indexOf("_a");             
        parentClass = parentClass.substr(0,parentClassNum);        
    }
    
    param.parentNode.className = parentClass;

}