/**
 * function _()
 *
 * Returns a DOM object
 *
 * @param str obj  The id of the DOM object to return
 * @return arr  The requested DOM object
 */	
function _(id){
    return document.getElementById(id);
}
function toggle(id){
    if (_(id).style.display == 'none'){
        _(id).style.display = 'block';
    }else{
        _(id).style.display = 'none';
    }
	return _(id).style.display;
}
function prToggle(id){
	mode = toggle('pr_'+id);
	if (mode == 'block'){
		_('title'+id).className = 'titleOpen';
	}else{
		_('title'+id).className = 'title';
	}
}