function HistoryStack() {this.stack=new Array();this.current=-1;this.stack_limit=15;} HistoryStack.prototype.getCurrent=function() {return this.stack[this.current];};HistoryStack.prototype.addResource=function(resource) {if(this.stack.length>0){this.stack=this.stack.slice(0,this.current+1);} this.stack.push(resource);while(this.stack.length>this.stack_limit){this.stack.shift();} this.current=this.stack.length-1;this.save();};HistoryStack.prototype.go=function(increment) {if(increment<0){this.current=Math.max(0,this.current+increment);}else if(increment>0){this.current=Math.min(this.stack.length-1,this.current+increment);}else{location.reload();} this.save();};HistoryStack.prototype.hasPrev=function() {return(this.current>0);};HistoryStack.prototype.hasNext=function() {return(this.current-1);};HistoryStack.prototype.save=function() {this.setCookie('CHStack',this.stack.toString());this.setCookie('CHCurrent',this.current);};HistoryStack.prototype.load=function() {var tmp_stack=this.getCookie('CHStack');if(tmp_stack!=''){this.stack=tmp_stack.split(',');} var tmp_current=parseInt(this.getCookie('CHCurrent'));if(tmp_current>=-1){this.current=tmp_current;}};HistoryStack.prototype.setCookie=function(name,value) {document.cookie="oldpage="+escape(HistoryStack.prototype.getCookie('page'));var cookie_str=name+"="+value;document.cookie=cookie_str;};HistoryStack.prototype.setCookieRegister=function(name,value) {var expires=14*1000*60*60*24;var today=new Date();today.setTime(today.getTime());var expires_date=new Date(today.getTime()+(expires));var cookie_str=name+"="+value+";expires="+expires_date.toGMTString()+";";document.cookie=cookie_str;};HistoryStack.prototype.getCookie=function(name) {if(!name)return'';var raw_cookies,tmp,i;var cookies=new Array();raw_cookies=document.cookie.split('; ');for(i=0;i