obj0style="none";
obj1style="none";
obj2style="none";
obj3style="none";
obj4style="none";

//expand or collaps div
function acad_expand(divname){
	obj0 = document.getElementById("acad_intro");
	obj1 = document.getElementById("acad_developer");
	obj2 = document.getElementById("acad_research");
	obj3 = document.getElementById("acad_interact");
	obj4 = document.getElementById("acad_jiangxiang");
	//close all
	obj0.style.display="none";
	obj1.style.display="none";
	obj2.style.display="none";
	obj3.style.display="none";
	obj4.style.display="none";
	//expand or collaps div
	if (divname == "acad_intro"){
		if (obj0style=="none"){	obj0style=""}
		else {obj0style="none";}		
		obj0.style.display=obj0style;
	}else if (divname == "acad_developer"){
		if (obj1style=="none"){	obj1style=""}
		else {obj1style="none";}		
		obj1.style.display=obj1style;
	}else if(divname == "acad_research"){
		if (obj2style=="none"){	obj2style=""}
		else {obj2style="none";}
		obj2.style.display=obj2style;
	}else if(divname == "acad_interact"){
		if (obj3style=="none"){	obj3style=""}
		else {obj3style="none";}
		obj3.style.display=obj3style;
	}else if(divname == "acad_jiangxiang"){
		if (obj4style=="none"){	obj4style=""}
		else {obj4style="none";}
		obj4.style.display=obj4style;
	}
	
}