add_emotion_textarea.js

		<script language="Javascript">

			jQuery.fn.extend({
				insertAtCaret: function(myValue) {
					return this.each(function(i) {
						if (document.selection) {
							//For browsers like Internet Explorer
							this.focus();
							sel = document.selection.createRange();
							sel.text = myValue;
							this.focus();
						}
						else if (this.selectionStart || this.selectionStart == '0') {
							//For browsers like Firefox and Webkit based
							var startPos = this.selectionStart;
							var endPos = this.selectionEnd;
							var scrollTop = this.scrollTop;
							this.value = this.value.substring(0, startPos)+myValue+this.value.substring(endPos,this.value.length);
							this.focus();
							this.selectionStart = startPos + myValue.length;
							this.selectionEnd = startPos + myValue.length;
							this.scrollTop = scrollTop;
						} else {
							this.value += myValue;
							this.focus();
						}
					})
				}
			});

			$(window).bind('load resize', '.selector', function() {
				$(".overflow-div").css("height",$(window).height()-220);
			});

			$("#_emoticonGallery li img").click(function(){
				rg = $("#content").val().match(/(\([a-z]*\)|\:\))/g);
				if(!rg || rg.length <5){
					$("#content").insertAtCaret(" "+$(this).attr("alt")+" ");
				}else{
					alert("Không được nhiều hơn 5 emotion");
				}
			});
			$("#content").keydown(function(){
				rg = $("#content").val().match(/(\([a-z]*\)|\:\))/g);
				if(!rg || rg.length <6){
				}else{
					alert("Không được nhiều hơn 5 emotion");
				}

			});

		</script>