//
// buster_nav_ie.js
// Functions to display the current position
// of the user in the "hierarchy" of Gunbuster
// pages.
//

// nav_relistPath
// Updates the layer with the current text.
function nav_relistPath() {
	var calcPath = "" ;
	for ( var i=0; i <= this.currentDepth; i++ ) {
		calcPath = calcPath + this.namedPath[i] + ":" ;
	}

	pathLayer = top.menuFrame.pathListId ;
	pathLayer.innerText = calcPath ;
	
	// Reassign location of pathlayer.  
	// pos- variables use original units assigned.
	// Should be px in this case.
	pathLayer.style.position = "relative" ;
	pathLayer.style.posTop = 0 ;
	pathLayer.style.posLeft = 0 ;
}


// nav_pushLevel
// Adds a level to the current directory path.
function nav_pushLevel( nextLevel, nextUrl ) {
	this.currentDepth = this.currentDepth + 1 ;
	this.namedPath[ this.currentDepth ]  = nextLevel ;
	this.urlPath[ this.currentDepth ] = nextUrl ;

	this.relistPath() ;
}

// nav_popLevel
// Removes a level from the current directory path.
function nav_popLevel() {
	if ( this.currentDepth > 0 ) {
		this.currentDepth = this.currentDepth - 1 ;

		this.relistPath() ;
	}
}

// nav_setLevel
// Sets a specific level of the navigation path.
// levelNum cannot be the top level (0).
function nav_setLevel( levelNum, levelName, levelUrl ) {
	if ( levelNum > 0 ) {
		this.currentDepth = levelNum ;
		this.namedPath[ this.currentDepth ] = levelName ;
		this.urlPath[ this.currentDepth ] = levelUrl ;

		this.relistPath() ;
	}
}

// nav_clearLevel
// Revoves a level and all succeeding levels from
// the navigation path.
// levelNum cannot be the top level (0).
function nav_clearLevel( levelNum ) {
	if ( levelNum > 0 ) {
		this.currentDepth = levelNum - 1 ;

		this.relistPath() ;
	}
}


// navPath
// Keeps track of Gunbuster navigation depth.
function NavPath( topLevel, topUrl ) {
	// setup variables
	this.namedPath = new Array() ;
	this.urlPath = new Array() ;
	this.currentDepth = 0 ;

	// setup methods
	this.pushLevel = nav_pushLevel ;
	this.popLevel = nav_popLevel ;
	this.relistPath = nav_relistPath ;
	this.setLevel = nav_setLevel ;
	this.clearLevel = nav_clearLevel ;

	// initialize values
	this.namedPath[0] = topLevel ;
	this.urlPath[0] = topUrl ;
}