click.js

// Simulate a click event on the matched id
HTMLElement.prototype.click = function() 
{
	var evt = this.ownerDocument.createEvent('MouseEvents');
	evt.initMouseEvent('click', true, true, this.ownerDocument.defaultView, 1, 0, 0, 0, 0, false, false, false, false, 0, null);
	this.dispatchEvent(evt);
}

document.getElementById("id").click();