// 获取HTML元素坐标值

function getElementPos(elementId) {
     var ua = navigator.userAgent.toLowerCase();
     var isOpera = (ua.indexOf('opera') != -1);
     var isIE = (ua.indexOf('msie') != -1 && !isOpera); // not opera spoof
     var el = document.getElementById(elementId);
     if(el.parentNode === null || el.style.display == 'none') {
      return false;
     }      
     var parent = null;
     var pos = [];     
     var box;     
     if(el.getBoundingClientRect)    //IE
     {         
      box = el.getBoundingClientRect();
      var scrollTop = Math.max(document.documentElement.scrollTop, document.body.scrollTop);
      var scrollLeft = Math.max(document.documentElement.scrollLeft, document.body.scrollLeft);
      return {x:box.left + scrollLeft, y:box.top + scrollTop};
     }else if(document.getBoxObjectFor)    // gecko    
     {
      box = document.getBoxObjectFor(el); 
      var borderLeft = (el.style.borderLeftWidth)?parseInt(el.style.borderLeftWidth):0; 
      var borderTop = (el.style.borderTopWidth)?parseInt(el.style.borderTopWidth):0; 
      pos = [box.x - borderLeft, box.y - borderTop];
     } else    // safari & opera    
     {
      pos = [el.offsetLeft, el.offsetTop];  
      parent = el.offsetParent;     
      if (parent != el) { 
       while (parent) {  
        pos[0] += parent.offsetLeft; 
        pos[1] += parent.offsetTop; 
        parent = parent.offsetParent;
       }  
      }   
      if (ua.indexOf('opera') != -1 || ( ua.indexOf('safari') != -1 && el.style.position == 'absolute' )) { 
       pos[0] -= document.body.offsetLeft;
       pos[1] -= document.body.offsetTop;         
      }    
     }              
     if (el.parentNode) { 
        parent = el.parentNode;
       } else {
        parent = null;
       }
     while (parent && parent.tagName != 'BODY' && parent.tagName != 'HTML') { // account for any scrolled ancestors
      pos[0] -= parent.scrollLeft;
      pos[1] -= parent.scrollTop;
      if (parent.parentNode) {
       parent = parent.parentNode;
      } else {
       parent = null;
      }
     }
     return {x:pos[0], y:pos[1]};
    }
    
//当获得焦点时事件
function ShowKey(MyKey)
{
    document.getElementById('ValidateKey').style.display='block';
    document.getElementById('ValidateKey').style.top=(getElementPos(MyKey.id).y-70)+'px';
    document.getElementById('ValidateKey').style.left=(getElementPos(MyKey.id).x)-2+'px';
}

//当获得焦点时事件
function HiddenKey()
{
    document.getElementById('ValidateKey').style.display='none';
}