function doStuff(obj, text, doReplace) {
	if(!doReplace)
		insertAtCaret(obj, text);
	else
		insertAroundSelection(obj, text);
}

function insertAroundSelection(obj, text) {
	if(document.selection) {
		obj.focus();
		var orig = obj.value.replace(/\r\n/g, "\n");
		var range = document.selection.createRange();
		
		if(range.parentElement() != obj) {
			return false;
		}
		var tmpSelection = range.text;
		range.text = text + tmpSelection + "</" + text.substr(1, text.length - 1);

		var actual = tmp = obj.value.replace(/\r\n/g, "\n");
		
		for(var diff = 0; diff < orig.length; diff++) {
			if(orig.charAt(diff) != actual.charAt(diff)) break;
		}
		
		for(var index = 0, start = 0; 
			tmp.match(text) 
			&& (tmp = tmp.replace(text, "")) 
			&& index <= diff; 
			index = start + text.length
			) {
			start = actual.indexOf(text, index);
		}
	} else if(obj.selectionEnd >= 0) {
		var start = obj.selectionStart;
		var end   = obj.selectionEnd;
		var diff  = end - start;
		//substr is not the same as substring!!! 
		obj.value = obj.value.substr(0, start) 
			+ text 
			+ obj.value.substr(start, diff)
			+ "</"
			+ text.substr(1, text.length - 1)
			+ obj.value.substr(end, obj.value.length);
	}
	
	if(start != null) {
		setCaretTo(obj, start + text.length);
	} else {
		obj.value += text;
	}
}

function insertAtCaret(obj, text) {
		if(document.selection) {
			obj.focus();
			var orig = obj.value.replace(/\r\n/g, "\n");
			var range = document.selection.createRange();

			if(range.parentElement() != obj) {
				return false;
			}

			range.text = text;
			
			var actual = tmp = obj.value.replace(/\r\n/g, "\n");

			for(var diff = 0; diff < orig.length; diff++) {
				if(orig.charAt(diff) != actual.charAt(diff)) break;
			}

			for(var index = 0, start = 0; 
				tmp.match(text) 
					&& (tmp = tmp.replace(text, "")) 
					&& index <= diff; 
				index = start + text.length
			) {
				start = actual.indexOf(text, index);
			}
		} else if(obj.selectionEnd >= 0) {
			var start = obj.selectionStart;
			var end   = obj.selectionEnd;
			
			obj.value = obj.value.substr(0, start) 
				+ text 
				+ obj.value.substr(end, obj.value.length);
		}
		
		if(start != null) {
			setCaretTo(obj, start + text.length);
		} else {
			obj.value += text;
		}
	}
	
	function setCaretTo(obj, pos) {
		if(obj.createTextRange) {
			var range = obj.createTextRange();
			range.move('character', pos);
			range.select();
		} else if(obj.selectionStart) {
			obj.focus();
			obj.setSelectionRange(pos, pos);
		}
	}

	function setTheObject(obj)
	{
		theObject = obj;
	}