// ===================================================================
// Author: Matt Kruse <matt@mattkruse.com>
// WWW: http://www.mattkruse.com/
//
// NOTICE: You may use this code for any purpose, commercial or
// private, without any further permission from the author. You may
// remove this notice from your final code if you wish, however it is
// appreciated by the author if at least my web site address is kept.
//
// You may *NOT* re-distribute this code in any way except through its
// use. That means, you can include it in your product, or your web
// site, or any other form where the code is actually being used. You
// may not put the plain javascript up on your site for download or
// include it in your javascript libraries for download.
// If you wish to share this code with others, please just point them
// to the URL instead.
// Please DO NOT link directly to my .js files from your site. Copy
// the files to your server and use them there. Thank you.
// ===================================================================

var DIF_dragging=false;var DIF_iframeBeingDragged="";var DIF_iframeObjects=new Object();var DIF_iframeWindows=new Object();var DIF_iframeMouseDownLeft = new Object();var DIF_iframeMouseDownTop = new Object();var DIF_pageMouseDownLeft = new Object();var DIF_pageMouseDownTop = new Object();var DIF_handles = new Object();var DIF_highestZIndex=99;var DIF_raiseSelectedIframe=false;var DIF_allowDragOffScreen=false;
function bringSelectedIframeToTop(val){DIF_raiseSelectedIframe = val;}
function allowDragOffScreen(val){DIF_allowDragOffScreen=val;}
function addHandle(o, win){if(arguments.length==2 && win==window){var p = win;while(p=p.parent){if(p.addHandle){p.addHandle(o,win,true);return;}if(p==win.top){return;}}return;}var topRef=win;var topRefStr = "window";while(topRef.parent && topRef.parent!=window){topRef = topRef.parent;topRefStr = topRefStr + ".parent";}if(typeof(win.DIF_mainHandlersAdded)=="undefined" || !win.DIF_mainHandlersAdded){with(win){eval("function OnMouseDownHandler(evt){if(typeof(evt)=='undefined'){evt=event;}"+topRefStr+".parent.DIF_begindrag(evt, "+topRefStr+")}");eval("document.onmousedown = OnMouseDownHandler;");eval("function OnMouseUpHandler(evt){if(typeof(evt)=='undefined'){evt=event;}"+topRefStr+".parent.DIF_enddrag(evt, "+topRefStr+")}");eval("document.onmouseup = OnMouseUpHandler;");eval("function OnMouseMoveHandler(evt){if(typeof(evt)=='undefined'){evt=event;}"+topRefStr+".parent.DIF_iframemove(evt, "+topRefStr+")}");eval("document.onmousemove = OnMouseMoveHandler;");win.DIF_handlersAdded = true;win.DIF_mainHandlersAdded = true;}}if(typeof(window.DIF_handlersAdded)!="undefined" || !window.DIF_handlersAdded){eval("function OnMouseMoveHandler(evt){if(typeof(evt)=='undefined'){evt=event;}DIF_mouseMove(evt, window)}");eval("document.onmousemove = OnMouseMoveHandler;");window.DIF_handlersAdded=true;}o.style.cursor="move";var name = DIF_getIframeId(topRef);if(DIF_handles[name]==null){DIF_handles[name] = new Array();DIF_iframeMouseDownLeft[name] = 0;DIF_iframeMouseDownTop[name] = 0;DIF_pageMouseDownLeft[name] = 0;DIF_pageMouseDownTop[name] = 0;}DIF_handles[name][DIF_handles[name].length] = o;}
function DIF_getEventPosition(evt){var pos=new Object();pos.x=0;pos.y=0;if(!evt){evt = window.event;}if(typeof(evt.pageX) == 'number'){pos.x = evt.pageX;pos.y = evt.pageY;}else{pos.x = evt.clientX;pos.y = evt.clientY;if(!top.opera){if((!window.document.compatMode) ||(window.document.compatMode == 'BackCompat')){pos.x += window.document.body.scrollLeft;pos.y += window.document.body.scrollTop;}else{pos.x += window.document.documentElement.scrollLeft;pos.y += window.document.documentElement.scrollTop;}}}return pos;}
function DIF_getIframeId(win){var iframes = document.getElementsByTagName("IFRAME");for(var i=0;i<iframes.length;i++){var o = iframes.item(i);var w = null;if(o.contentWindow){w = o.contentWindow;}else if(window.frames && window.frames[o.id].window){w = window.frames[o.id];}if(w == win){DIF_iframeWindows[o.id] = win;DIF_iframeObjects[o.id] = o;return o.id;}}return null;}
function DIF_getObjectXY(o){var res = new Object();res.x=0;res.y=0;if(o != null){res.x = o.style.left.substring(0,o.style.left.indexOf("px"));res.y = o.style.top.substring(0,o.style.top.indexOf("px"));}return res;}
function getSrcElement(e){var tgt = e.target;while(tgt.nodeType != 1){tgt = tgt.parentNode;}return tgt;}
function isHandleClicked(handle, objectClicked){if(handle==objectClicked){return true;}while(objectClicked.parentNode != null){if(objectClicked==handle){return true;}objectClicked = objectClicked.parentNode;}return false;}
function DIF_begindrag(e, win){var iframename = DIF_getIframeId(win);if(iframename==null){return;}if(DIF_handles[iframename]==null || DIF_handles[iframename].length<1){return;}var isHandle = false;var t = e.srcElement || getSrcElement(e);for(var i=0;i<DIF_handles[iframename].length;i++){if(isHandleClicked(DIF_handles[iframename][i],t)){isHandle=true;break;}}if(!isHandle){return false;}DIF_iframeBeingDragged = iframename;if(DIF_raiseSelectedIframe){DIF_iframeObjects[DIF_iframeBeingDragged].style.zIndex=DIF_highestZIndex++;}DIF_dragging=true;var pos=DIF_getEventPosition(e);DIF_iframeMouseDownLeft[DIF_iframeBeingDragged] = pos.x;DIF_iframeMouseDownTop[DIF_iframeBeingDragged] = pos.y;var o = DIF_getObjectXY(DIF_iframeObjects[DIF_iframeBeingDragged]);DIF_pageMouseDownLeft[DIF_iframeBeingDragged] = o.x - 0 + pos.x;DIF_pageMouseDownTop[DIF_iframeBeingDragged] = o.y -0 + pos.y;}
function DIF_enddrag(e){DIF_dragging=false;DIF_iframeBeingDragged="";}
function DIF_mouseMove(e){if(DIF_dragging){var pos = DIF_getEventPosition(e);DIF_drag(pos.x - DIF_pageMouseDownLeft[DIF_iframeBeingDragged] , pos.y - DIF_pageMouseDownTop[DIF_iframeBeingDragged]);}}
function DIF_iframemove(e){if(DIF_dragging){var pos = DIF_getEventPosition(e);DIF_drag(pos.x - DIF_iframeMouseDownLeft[DIF_iframeBeingDragged] , pos.y - DIF_iframeMouseDownTop[DIF_iframeBeingDragged]);}}
function DIF_drag(x,y){var o = DIF_getObjectXY(DIF_iframeObjects[DIF_iframeBeingDragged]);var newPositionX = o.x-0+x;var newPositionY = o.y-0+y;if(!DIF_allowDragOffScreen){if(newPositionX < 0){newPositionX=0;}if(newPositionY < 0){newPositionY=0;}}DIF_iframeObjects[DIF_iframeBeingDragged].style.left = newPositionX + "px";DIF_iframeObjects[DIF_iframeBeingDragged].style.top  = newPositionY + "px";DIF_pageMouseDownLeft[DIF_iframeBeingDragged] += x;DIF_pageMouseDownTop[DIF_iframeBeingDragged] += y;}