var clientRect = document.getElementById('targetLink').getBoundingClientRect();
x = (clientRect.left + clientRect.right) / 2;
y = (clientRect.top + clientRect.bottom) / 2;
var clientRect = document.getElementById('targetLink').getBoundingClientRect();
x = (clientRect.left + clientRect.right) / 2;
y = (clientRect.top + clientRect.bottom) / 2;