//prototypes
Array.prototype.del = function(dx){if(isNaN(dx)||dx>this.length){return false;}this.splice(dx,1);}
var IS_IE = (navigator.userAgent.toLowerCase().indexOf("msie") > -1) ? true : false;
var IS_FF = (navigator.userAgent.toLowerCase().indexOf("firefox") > -1) ? true : false;
var IS_OPERA = (navigator.userAgent.toLowerCase().indexOf("opera") > -1) ? true : false;
//获得域名
var domain;
domain=location.hostname;
if(location.port){
	domain+=":"+location.port
}
//获取鼠标位置
function getMousePos(ev){   
	if(ev.pageX || ev.pageY){   
		return {x:ev.pageX, y:ev.pageY};
	}   
	return{   
		x:ev.clientX + document.documentElement.scrollLeft - document.documentElement.clientLeft,   
		y:ev.clientY + document.documentElement.scrollTop - document.documentElement.clientTop   
	};   
}