// 统一控制元素内的checkbox
function checkAll(eId,checked){
  var cbxs = document.getElementById(eId).getElementsByTagName('input');
  for ( i = 0; i < cbxs.length; i++ ) {
  	cbxs[i].checked = checked;
  }
}

// 切换元素显示状态
function switchVisibility(e,v) {
  if (typeof(e) == typeof('')){
    e = document.getElementById(e);
  }
  _v = '';
  if (v!=null){
    e.style.display = (v==true)?'':'none';
  } else {
    e.style.display = (e.style.display=='none')?'':'none'
  }
}

// 增加时间
function addDaysToDate(myDate,days) {
  return new Date(myDate.getTime() + days*24*60*60*1000);
}

//获取位置y
function getY(e){
  y = 0;
  while(e != null){
    y += e.offsetTop;
    e = e.offsetParent;
  }
  return y;
}

//获取位置x
function getX(e){
  x = 0;
  while(e != null){
    x += e.offsetLeft;
    e = e.offsetParent;
  }
  return x;
} 

function DateAdd( dateObj, days )

{
    var tempDate = dateObj.valueOf();
    tempDate = tempDate + days * 24 * 60 * 60 * 1000
    tempDate = new Date(tempDate)
    return tempDate;
}