/**
 * @author liudg
 * mail dongguang@staff.sina.com.cn || ldgmc@126.com
 */
function $(id){return document.getElementById(id)};
function getRandomNum(min,max){
	return min+Math.floor(Math.random()*(max-min+1));
}
function addEvent(elm, func, evType, useCapture) {
	//var elm = $(elm);
	if(typeof useCapture == 'undefined') useCapture = false;
	if(typeof evType == 'undefined')  evType = 'click';
	if (elm.addEventListener) {
		elm.addEventListener(evType, func, useCapture);
		return true;
	}
	else if (elm.attachEvent) {
		var r = elm.attachEvent('on' + evType, func);
		return true;
	}
	else {
		elm['on' + evType] = func;
	}
};
function swapDisplay(ele1,ele2,isTrue){
	if(isTrue){
		ele1.style.display="block"	
		ele2.style.display="none"
	}else{
		ele1.style.display="none"	
		ele2.style.display="block"
	}
}
function GetCurrentStyle(obj, prop){
	if (obj.currentStyle) {
		return obj.currentStyle[prop];
	}
	else if (window.getComputedStyle) {
		prop = prop.replace(/([A-Z])/g, "-$1");
		prop = prop.toLowerCase();
		return window.getComputedStyle(obj, "").getPropertyValue(prop);
	}
	return null;
}