/* carl@criticalmass.com */
function MainMenu(id){
	var t = this;
	t.navObg = document.getElementById(id);
	t.catCollection = [];
	t.subCatCollection = [];
	t.imgSrcMouseOverPattern = "_1.";
	t.imgSrcMouseOutPattern = "_0.";
	t.swapImg = function(){
		this.src = altImgSrc(this);
	}
	var altImgSrc = function(imgObj){
		return (imgObj.src.indexOf(t.imgSrcMouseOverPattern)!=-1)?imgObj.src.replace(t.imgSrcMouseOverPattern,t.imgSrcMouseOutPattern):imgObj.src.replace(t.imgSrcMouseOutPattern,t.imgSrcMouseOverPattern);
	}
	t.getCategories = function(){
		var categories = t.navObg.getElementsByTagName("DIV")[0].getElementsByTagName("UL")[0].getElementsByTagName("LI");
		for(var i=0; i<categories.length; i++){
			var imgObj = categories[i].getElementsByTagName("IMG")[0];
			t.catCollection[t.catCollection.length] = categories[i];
			imgObj.onmouseover = t.swapImg;
			imgObj.onmouseout = t.swapImg;
		}
		var img = new Image();
		img.src = altImgSrc(imgObj);	
	}
	t.getSubCategories = function(){
		var subCategoryParents = t.navObg.getElementsByTagName("DIV")[1].getElementsByTagName("UL");
		for(var i=0; i<subCategoryParents.length; i++){
			var subCategoryChildren = subCategoryParents[i].getElementsByTagName("LI");
			t.subCatCollection[i] = [];
			for(var j=0; j<subCategoryChildren.length; j++){
				t.subCatCollection[i][j] = subCategoryChildren[j];
				var imgObj = subCategoryChildren[j].getElementsByTagName("IMG")[0];
				subCategoryChildren[j].onmouseover = t.subSectionImgSwap;
				subCategoryChildren[j].onmouseout = t.subSectionImgSwap;
			}
			var img = new Image();
			img.src = altImgSrc(imgObj);
		}
	}
	t.subSectionImgSwap = function(){
		var imgObj = this.getElementsByTagName("IMG")[0];
		imgObj.src = altImgSrc(imgObj);
	}
	t.setSection = function(){
		var cat = arguments[0];
		var subCat = arguments[1];
		if(cat!=null){
			var catObj = t.catCollection[cat];
			if(catObj){
				var catImg = catObj.getElementsByTagName("IMG")[0];
				
				catImg.onmouseover = function(){};
				catImg.onmouseout = function(){};
				// t.subCatCollection[cat][0].parentNode.parentNode.className = "main-menu-sub-category-active";
			}else{
				window.status = "Tab "+ cat +" does not exist.";
			}
		}
		if(subCat!=null){
			var subCatObj = t.subCatCollection[cat][subCat];
			if(subCatObj && subCatObj.className.indexOf("main-menu-sub-category-additional")==-1){
				subCatObj.className = "main-menu-sub-category-active";
				subCatObj.onmouseover = function(){}
				subCatObj.onmouseout = function(){}
				var imgObj2 = subCatObj.getElementsByTagName("IMG")[0];
				imgObj2.src = imgObj2.src.replace("double_arrow_0","single_arrow_down_1") ;
			}else{
				window.status = "Sub category "+ subCat +" does not exist.";
			}
		}
	}
	var constructor = function(){
		t.getCategories();
		t.getSubCategories();
	}
	constructor();
}