if(!Array.prototype.indexOf){Array.prototype.indexOf=function(elm,i){
		var j=this.length;
		if(!i)i=0;
		if(i>=0){while(i<j){if(this[i++]===elm){
			i=i-1+j;j=i-j;
		}}}
		else
			j=this.indexOf(elm,j+i);
		return j!==this.length?j:-1;
	}};