document.onclick=check;
function check(e){
var target = (e && e.target) || (event && event.srcElement);
var obj = document.getElementById('link_list');
var obj2 = document.getElementById('share_a_link');
if (checkParent(target) && target!=obj2) {
	obj.style.display='none';
	return true;
}
if (target==obj2 && obj.style.display=='none') {
	obj.style.display='block';
	return true;
}
if (target==obj2 && obj.style.display=='block') {
	obj.style.display='none';
	return true;
}

}
function checkParent(t){
while(t.parentNode){
if(t==document.getElementById('link_list')){
return false
}
t=t.parentNode
}
return true
}