var historyStack=Class.create();historyStack.prototype={isIE:true,isOpera:true,pe:0,interval:1,current:0,ieFrameLiteral:"historyFrame",ieFrame:0,histVarName:"",protocol:0,checkIE:function(){var userAgent=navigator.userAgent.toLowerCase();if(document.all&&userAgent.indexOf('msie')!=-1){return true;}
else{return false;}},checkOpera:function(){var userAgent=navigator.userAgent.toLowerCase();if(userAgent.indexOf("opera")!=-1){var versionindex=userAgent.indexOf("opera")+6;if(parseInt(userAgent.charAt(versionindex))>=8){return true;}
else
return false;}else
return false;},initialize:function(histVarName,protocol){this.isIE=this.checkIE();this.isOpera=this.checkOpera();this.protocol=protocol;if(this.isIE){this.histVarName=histVarName;this.ieFrame=document.createElement("iframe");this.ieFrame.id=this.ieFrameLiteral;this.ieFrame.style.display="none";if(this.protocol=="https")this.ieFrame.src="stupidIE.html";if(document.body.firstChild)
document.body.insertBefore(this.ieFrame,document.body.firstChild);else
document.body.appendChild(this.ieFrame);}
this.pe=new PeriodicalExecuter(this.getUrl.bind(this),this.interval);},put:function(s){if(this.isIE){this.writeFrame(s);}
this.pe.stop();document.location.hash=s;this.current=s;this.pe=new PeriodicalExecuter(this.getUrl.bind(this),this.interval);},get:function(){return document.location.hash;},getUrl:function(){var h=this.removeHash(document.location.hash);if(h!=this.current){this.current=h;this.onBrowserAddressChanged();}},onBrowserAddressChanged:function(){},removeHash:function(hashValue){if(hashValue==null||hashValue==undefined)
return null;else if(hashValue=="")
return"";else if(hashValue.length==1&&hashValue.charAt(0)=="#")
return"";else if(hashValue.length>1&&hashValue.charAt(0)=="#")
return hashValue.substring(1);else
return hashValue;},writeFrame:function(s){var f=$(this.ieFrameLiteral);var d=f.contentDocument||f.contentWindow.document;var str="<script>window._hash = '"+s+"'; window.onload = parent."+this.histVarName+".syncHash;<\/script>";var state="session";d.open();d.write(str);d.write(state);d.close();},syncHash:function(){var s=this._hash;if(s!=document.location.hash){document.location.hash=s;}},sessionExists:function(){var f=$(this.ieFrameLiteral);var doc=f.contentDocument||f.contentWindow.document;try{if(doc.body.innerHTML=="")
return false;else
return true;}
catch(exp){return true;}}};