//+ Jonas Raoni Soares Silva
//@ http://jsfromhell.com/forms/selection [v1.0]
/**
 *	changed by David Sevcik
 *	@version 1.1
 */

Selection=function(input)
{
	this.isTA=(this.input=input).nodeName.toLowerCase()=="textarea";
};

with({o:Selection.prototype})
{
	o.setCaret=function(start, end)
	{
		if(typeof start=='object')
			end=start.end,start=start.start;

		var o=this.input;
		if(Selection.isStandard)
			o.setSelectionRange(start,end);
		else if(Selection.isSupported)
		{
			var t=this.input.createTextRange();
			end-=start+o.value.slice(start+1,end).split("\n").length-1;
			start-=o.value.slice(0,start).split("\n").length-1;
			t.move("character",start),t.moveEnd("character",end),t.select();
		}
	};

	o.getCaret=function()
	{
		var o=this.input, d=document;
		if(Selection.isStandard)
			return {start:o.selectionStart,end:o.selectionEnd};
		else if(Selection.isSupported)
		{
			var s=(this.input.focus(), d.selection.createRange()), r, start, end, value;
			if(s.parentElement()!=o)
				return {start:0,end:0};
			if(this.isTA?(r=s.duplicate()).moveToElementText(o):r=o.createTextRange(),!this.isTA)
				return r.setEndPoint("EndToStart",s),{start:r.text.length,end:r.text.length+s.text.length};
			for(var $="[###]";(value=o.value).indexOf($)+1;$+=$);
			r.setEndPoint("StartToEnd",s),r.text=$+r.text,end=o.value.indexOf($);
			s.text=$,start=o.value.indexOf($);
			if(d.execCommand && d.queryCommandSupported("Undo"))
				for(r=3;--r;d.execCommand("Undo"));
			return o.value=value,this.setCaret(start,end),{start:start,end:end};
		}

		return {start:0,end:0};
	};

	o.getText = function(){
		var o = this.getCaret();
		return this.input.value.slice(o.start, o.end);
	};

	o.setText=function(text, all)
	{
		var o=this.getCaret(), i=this.input, s=i.value;
		text=text.toString();
		i.value=s.slice(0,o.start)+text+s.slice(o.end);
		o.end=o.start+text.length;
		if(!all)o.start=o.end;
		this.setCaret(o);
	};

	new function()
	{
		var d=document, o=d.createElement("input"), s=Selection;
		s.isStandard="selectionStart" in o;
		s.isSupported=s.isStandard || (o=d.selection) && !!o.createRange();
	};
}