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 = [];  //不定长数组？   
    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]};  
}

function ScrollToControl(id){
	var scrollPos = getElementPos(id).y;
	window.scrollTo(0,scrollPos);
}