// JavaScript Document

/** 
* ajaxHistory - histσrico de comandos para navegaηγo por Ajax 
* ———————————————– 
* autor: Cau Guanabara 
* data: 2006-06-07 :: 2006-11-07 
* ———————————————– 
*/ 

var ajaxHistory = { 
	"items": [], 
	"captions": [], 
	"currentIndex": 0, 
	"go": function(ref) {	
			if(this.items[this.currentIndex + ref] || false) this.currentIndex += ref; 
			else return; 
			if(this.activeHistory) this.setHash(); 
			new Function(this.items[this.currentIndex])(); 
		  }, 
		  
		  
	"goTo": function(ind) {	
			if(this.items[ind] || false) this.currentIndex = ind; 
			else return; 
			if(this.activeHistory) this.setHash(); 
			new Function(this.items[this.currentIndex])(); 
		  }, 


	"add": function(str, cap) { 
			if(str == this.items[this.currentIndex]) return false; 
			this.currentIndex = this.items.length; 
			this.items.push(str); 
			if(this.activeHistory && !cap) this.setHash();
			return true; 
		  },
		  
		  
	"hasBack": function() { return (this.items[this.currentIndex - 1] || false) ? true : false; }, 
	
	"hasForward": function() { return (this.items[this.currentIndex + 1] || false) ? true : false; }, 
	"activeHistory": false, 
	
	"activateBrowserHistory": function() {//if(document.all) 
								this.makeIframe(); 
								setInterval("ajaxHistory.checkHash()", 100); 
								this.activeHistory = true; 
								}, 
								
	"makeIframe": function() { 
					this.iframe = document.createElement("iframe"); 
					this.iframe.style.display = "none"; 
					this.iframe.src = "shp_util/historyframe.html?0"; 
					document.getElementsByTagName("body")[0].appendChild(this.iframe); 
				  }, 
				  
				  
	"checkHash": function() { 
					var curHash = location.hash.replace(/#/,""); 
					if(this.currentIndex != curHash) this.goTo(curHash); 
				 },
				 
				 
	"setHash": function() { 
	//alert(this.currentIndex);
				top.location.hash = this.currentIndex; 
				if(document.all)					
				this.iframe.contentWindow.location.href = "shp_util/historyframe.html?"+this.currentIndex;
				
	} 
};