drag & drop

function Iframe(){

		_this = this;

		this.dragObject  = null;

		this.mouseOffset = null;

		this.mouseMove = function(ev){

			ev = ev || window.event;

			var mousePos = _this.mouseCoords(ev);

			if(_this.dragObject){

				_this.dragObject.style.position = 'absolute';

				_this.dragObject.style.top      = mousePos.y - _this.mouseOffset.y;

				_this.dragObject.style.left     = mousePos.x - _this.mouseOffset.x;

				return false;

			}

		}

		this.mouseCoords = function(ev){

			if(ev.pageX || ev.pageY){

				return {x:ev.pageX, y:ev.pageY};

			}

			return {

				x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,

				y:ev.clientY + document.body.scrollTop  - document.body.clientTop

			};

		}

		this.getPosition = function(e){

			var left = 0;

			var top  = 0;

			while (e.offsetParent){

				left += e.offsetLeft;

				top  += e.offsetTop;

				e     = e.offsetParent;

			}

			left += e.offsetLeft;

			top  += e.offsetTop;

			return {x:left, y:top};

		}

		

		this.getMouseOffset = function(target, ev){

			ev = ev || window.event;

			var docPos    = _this.getPosition(target);

			var mousePos  = _this.mouseCoords(ev);

			return {x:mousePos.x - docPos.x, y:mousePos.y - docPos.y};

		}

		

		this.mouseUp = function(){

			_this.dragObject = null;

		}

	}



	Iframe.prototype.construct = function(e){

		_this = this;

		var header = document.createElement('div');

		var footer = document.createElement('div');

		var ifrm = document.createElement('iframe');

		ifrm.src = 'http://www.seznam.cz';

		ifrm.style.border = 'none';

		

		header.style.height = '20px';

		header.style.width='100%';

		header.style.backgroundColor = '#CCC';

		

			

		footer.style.height = '20px';

		footer.style.width='100%';

		footer.style.backgroundColor = '#CCC';



		var win = document.createElement('div');

		win.style.position = 'absolute';

		win.style.left = '200px';

		win.style.top = '200px';

		win.style.width = '300px';

		win.style.height = '200px';





		

		win.appendChild(header);

		win.appendChild(ifrm);

		win.appendChild(footer);

		win.onmousedown = function(ev){

			_this.dragObject  = this.parentNode;

			_this.mouseOffset = _this.getMouseOffset(this, ev);

			return false;

		}

		document.getElementsByTagName('body')[0].appendChild(win);

		

		document.onmousemove = this.mouseMove;

		document.onmouseup   = this.mouseUp;

		}