function send_to_friend(product_id, e){
	var posx = 0;
	var posy = 0;
	if (!e) var e = window.event;
	if (e.pageX || e.pageY){
		posx = e.pageX;
		posy = e.pageY;
	}
	else if (e.clientX || e.clientY){
		posx = e.clientX + document.body.scrollLeft
			+ document.documentElement.scrollLeft;
		posy = e.clientY + document.body.scrollTop
			+ document.documentElement.scrollTop;
	}
	
	var ds = document.getElementById('div_send_to_friend');
	ds.style.left = posx - 100;
	ds.style.top = posy;
	ds.style.display = 'block';
	document.getElementById('send_to_friend_product_id').value = product_id;
}

function filter_numeric(textbox, val){
	val = val.replace(/[^0-9.]/g, ''); // strip non-digit chars
	val = stripDuplicateChars(val, '.', 1, 0); // strip excess decimals
	val = stripDuplicateChars(val, '-', 0, 1); // strip excess minus signs
	textbox.value = val; // replace textbox value
}