var ResizingTextArea = Class.create();
	
ResizingTextArea.prototype = {
    defaultRows: 1,
    initialize: function(field){
      this.defaultRows = Math.max(field.rows, 1);
      this.resizeNeeded = this.resizeNeeded.bindAsEventListener(this);
      Event.observe(field, "click", this.resizeNeeded);
      Event.observe(field, "keyup", this.resizeNeeded);    },
	
    resizeNeeded: function(event)
    {
        var t = Event.element(event);
        var lines = t.value.split('\n');
        var newRows = lines.length + 1;
        var oldRows = t.rows;
        for (var i = 0; i <lines.length; i++)
	
        {
	
            var line = lines[i];
	
            if (line.length>= t.cols) newRows += Math.floor(line.length / t.cols);
	
        }
	
        if (newRows> t.rows) t.rows = newRows;
	
        if (newRows <t.rows) t.rows = Math.max(this.defaultRows, newRows);
	
    }
	
}