function ua(){
	var d = document;
	var n = navigator;
	var n_ua = n.userAgent;
	var n_app = n.appName;
	var n_ver = n.appVersion;
	
	//detect ua
	ua.dom = d.getElementById;
	ua.omn = (n_ua.indexOf("OmniWeb") != -1);
	ua.n4 = (d.layers && (!ua.omn));
	ua.opera = (window.opera);
	ua.ie = (d.all && !ua.opera);
	ua.safari = (n_ua.indexOf("Safari",0) != -1);
	ua.gecko = ((n_ua.indexOf("Gecko/",0) != -1) && !ua.safari);
	ua.netscape = (n_ua.match(/Netscape/));
	
	//get browser version
	if(RegExp){
		if(ua.ie){
			ua.ver = n_ver.match(/MSIE (\d(.\d+)?)/)[1];
		}
		if(ua.gecko){
			ua.ver = n_ver.match(/(\d(.\d+)?) \(/)[1];
		}
		if(ua.netscape){
			ua.ver = n_ua.match(/Netscape\/(\d(.\d+)?)/)[1];
		}
		if(ua.opera){
			ua.ver = n_ua.match(/Opera[ \/](\d(.\d+)?)/)[1];
		}
		ua.ver = parseFloat(ua.ver);
	}else{
		ua.ver = undefined;
	}

	//detect os
	ua.mac = (n_ver.indexOf('Mac',0) != -1);
	ua.win = (n_ver.indexOf('Win',0) != -1);
}
new ua();


//Array Prototype
if(!Array.push){
	Array.prototype.push = function(elem){
		this[this.length] = elem;
	}
}

Array.prototype.indexOf = function(value){
	var i = 0;
	while(i < this.length){
		if(this[i] == value) return i;
		i++;
	}
	return -1;
}

Array.prototype.remove = function(value){
	this.splice(this.indexOf(value),1);
}

//ClassNames
function ClassNames(obj){
	this.obj = obj;
	this.cns = obj.className.split(/\s+/);
};

ClassNames.prototype.add = function(value){
	if(!this.has(value)){
		this.cns.push(value);
		this.obj.className = this.cns.join(' ');
	}
}

ClassNames.prototype.remove = function(value){
	this.cns.remove(value);
	this.obj.className = this.cns.join(' ');
}

ClassNames.prototype.has = function(value){
	if(this.cns.indexOf(value) == -1){
		return false;
	}
	return true;
}

//getElementsbyAttr
document.getElementsByAttr = function(aName, aValue, tName){
	if(document.all || document.getElementsByTagName){
		var attr, elements, result = [];
		
		if(tName){
			elements = document.all ? document.all.tags(tName.toUpperCase()) : document.getElementsByTagName(tName);
		}else{
			elements = document.all ? document.all : document.getElementsByTagName("*");
		}

		for(var i=0;i<elements.length;i++){
			if(aName == 'class' && elements[i].className){
				attr = elements[i].classNames = new ClassNames(elements[i]);
				if(aValue && !attr.has(aValue)){
					continue;
				}
				result.push(elements[i]);
			}else if(elements[i].getAttribute(aName)){
				attr = elements[i].getAttribute(aName);
				if(aValue && attr != aValue){
					continue;
				}
				result.push(elements[i]);
			}
 		}
	}
	return result;
}


//Roll Over Image
function preloadImg(src){
	if(document.images){
		(new Image()).src = src;
	}
}

function preloadImgs(srcs){
	if(!document.images) return;
	for (i=0;i<srcs.length;i++){
		preloadImg(srcs[i]);
	}
}

function RollOverImages(targetClass,overImageSafix,downImageSafix){
	if(!document.kkROI) document.kkROI = this;
	this.targetClass = targetClass;
	this.overImageSafix = overImageSafix;
	this.downImageSafix = downImageSafix;
	if(targetClass && (overImageSafix || downImageSafix)) this.define();
}

RollOverImages.prototype.imgs = new Object;

RollOverImages.prototype.swap = function(names,status){
	for(var i=0;i<names.length;i++){
		if(this.imgs[names[i]][status]){
			var tempobj = (document.all)? document.all[names[i]] : document.getElementById(names[i]);
			tempobj.src = this.imgs[names[i]][status];
		}
	}
}

RollOverImages.prototype.define = function(){
	if(!document.getElementById) return;
	if(!document.images) return;
	var idprefix = 'kkROIti_';
	var pli = new Array();
	var ois = this.overImageSafix;
	var dis = this.downImageSafix;
	var objs = document.getElementsByAttr('class',this.targetClass);
	if(objs.length == 0){
		objs = document.getElementsByAttr('class',this.targetClass,'img');
	}
	for(var i=0;i<objs.length;i++){
		var tempimg = objs[i];
		tempimg.id = (tempimg.id)? tempimg.id : (idprefix + this.targetClass + '_' + i);
		var basesrc = tempimg.src;
		var imgtype = basesrc.substring(basesrc.lastIndexOf('.'));
		var basename = basesrc.substring(0,basesrc.length - imgtype.length);
		var temppli = new Object;
		tempimg.u = basesrc;
		if(ois) tempimg.o = temppli.o = basename + ois + imgtype;
		if(dis) tempimg.a = temppli.a = basename + dis + imgtype;
		this.imgs[tempimg.id] = tempimg;
		if(pli.indexOf(temppli.o) == -1) pli.push(temppli.o);
		if(dis && pli.indexOf(temppli.a) == -1) pli.push(temppli.a);
		if(tempimg.tagName == 'IMG'){
			var pa = tempimg.parentNode;
			for(var j=0;j<10;j++){
				if(pa && pa.tagName == 'A'){
					if(!pa.kkROIti) pa.kkROIti = new Array();
					pa.kkROIti.push(tempimg.id);
					if(!pa.onmouseover) pa.onmouseover = function(){this._onfocus = this.onfocus; this.onfocus = ''; document.kkROI.swap(this.kkROIti,'o');};
					if(ois && !pa.onmouseout) pa.onmouseout = function(){this.onfocus = this._onfocus; document.kkROI.swap(this.kkROIti,'u');};
					if(dis && !pa.onmousedown) pa.onmousedown = function(){document.kkROI.swap(this.kkROIti,'a');};
					if(ois && dis && !pa.onmouseup) pa.onmouseup = function(){document.kkROI.swap(this.kkROIti,'o');};
					if(ois && !pa.onfocus) pa.onfocus = function(){document.kkROI.swap(this.kkROIti,'o');};
					if(!pa.onblur) pa.onblur = function(){document.kkROI.swap(this.kkROIti,'u');};
					if(dis && !pa.onkeypress) pa.onkeypress = function(){document.kkROI.swap(this.kkROIti,'a');};
					if(ois && dis && !pa.onkeyup) pa.onkeyup = function(){document.kkROI.swap(this.kkROIti,'o');};
					break;
				}else if(pa.parentNode){
					pa = pa.parentNode;
				}else{
					break;
				}
			}
		}else if(tempimg.tagName == 'INPUT'){
			tempimg.kkROIti = [tempimg.id];
			if(!tempimg.onmouseover) tempimg.onmouseover = function(){this._onfocus = this.onfocus; this.onfocus = ''; document.kkROI.swap(this.kkROIti,'o');};
			if(ois && !tempimg.onmouseout) tempimg.onmouseout = function(){this.onfocus = this._onfocus; document.kkROI.swap(this.kkROIti,'u');};
			if(dis && !tempimg.onmousedown) tempimg.onmousedown = function(){document.kkROI.swap(this.kkROIti,'a');};
			if(ois && dis && !tempimg.onmouseup) tempimg.onmouseup = function(){document.kkROI.swap(this.kkROIti,'o');};
			if(ois && !tempimg.onfocus) tempimg.onfocus = function(){document.kkROI.swap(this.kkROIti,'o');};
			if(!tempimg.onblur) tempimg.onblur = function(){document.kkROI.swap(this.kkROIti,'u');};
			if(dis && !tempimg.onkeypress) tempimg.onkeypress = function(){document.kkROI.swap(this.kkROIti,'a');};
			if(ois && dis && !tempimg.onkeyup) tempimg.onkeyup = function(){document.kkROI.swap(this.kkROIti,'o');};
		}
	}
	preloadImgs(pli);
}