/*var scroll_timer;
var slideouter;
var slideinner;
var scrolling=false;
var step=20;
var scrolled=0;
var step2=126;
var curpos=0;
var maxpos=2;
var arrleft,arrright;
function jiangshi_slide(dir){
	if(scrolling || (curpos+dir>maxpos || curpos+dir<0)) return;
	scrolling=true;
	slideouter=document.getElementById("xueyuanjiangshi-list");
	slideinner=document.getElementById("xueyuanjiangshi-list-inner");
	arrleft=document.getElementById("xueyuanjiangshi-arrleft");
	arrright=document.getElementById("xueyuanjiangshi-arrright");
	curpos+=dir;
	clearInterval(scroll_timer);
	scroll_timer=setInterval(function(){jiangshi_scroll(dir)},10);
	
}
function jiangshi_scroll(dir){
	if(scrolled>=step2){
		clearInterval(scroll_timer);
		slideinner.style.left=(-curpos*step2)+"px";
		scrolled=0;
		scrolling=false;
		arrleft.style.background=curpos>0?"url(http://static.alibado.com/images_v1_0/button_teacherlistleft.png)":"url(http://static.alibado.com/images_v1_0/button_teacherlistleft_disable.png)";
		arrright.style.background=curpos<maxpos?"url(http://static.alibado.com/images_v1_0/button_teacherlistright.png)":"url(http://static.alibado.com/images_v1_0/button_teacherlistright_disable.png)";
		arrleft.style.cursor=curpos>0?"pointer":"default";
		arrright.style.cursor=curpos<maxpos?"pointer":"default";
		return;
	}
	slideinner.style.left=(slideinner.offsetLeft+(-dir*step))+"px";
	scrolled+=step;
}*/

var scrollTimer;
var scrollRange=[-252,0];
function startScroll(dir){
	scrollTimer=setInterval(function(){
									 var o=document.getElementById("xueyuanjiangshi-list-inner");
									 var bl=document.getElementById("xueyuanjiangshi-arrleft"),br=document.getElementById("xueyuanjiangshi-arrright")
									 var step=1*dir;
									 if((o.offsetLeft-5)+step>scrollRange[1]){
										 o.style.left=scrollRange[1]+"px";
										 return;
									 }
									 if((o.offsetLeft-5)+step<scrollRange[0]){
										 o.style.left=scrollRange[0]+"px";
										 return;
									 }
									 o.style.left=((o.offsetLeft-5)+step)+"px";
									 if(o.offsetLeft-5>=scrollRange[1]){
										 bl.style.background="url(http://static.alibado.com/images_v1_0/button_teacherlistleft_disable.png)";
										 br.style.background="url(http://static.alibado.com/images_v1_0/button_teacherlistright.png)";
									 }
									 else if(o.offsetLeft-5<=scrollRange[0]){
										 bl.style.background="url(http://static.alibado.com/images_v1_0/button_teacherlistleft.png)";
										 br.style.background="url(http://static.alibado.com/images_v1_0/button_teacherlistright_disable.png)";
									 }
									 else{
										 bl.style.background="url(http://static.alibado.com/images_v1_0/button_teacherlistleft.png)";
										 br.style.background="url(http://static.alibado.com/images_v1_0/button_teacherlistright.png)";
									 }
									 },20);
}
function stopScroll(){
	clearInterval(scrollTimer);
}