function selectAreaChange(top,subtop)
{
		var selectTop=document.getElementById(top);
		var selectSubTop=document.getElementById(subtop);
		for(n = selectSubTop.length - 1; n >=0; n--)		//清空下一级
		{
			selectSubTop.options[n] = null;
		}	
		topValue = selectTop.value;			//获取上一级值			
		selectSubTop.options[selectSubTop.length] = new Option("请选择","");		
		for (n=0; n<areaGroup.length; n++)
		{
			if(areaGroup[n][0] == topValue)
			{
				selectSubTop.options[selectSubTop.length] = new Option(areaGroup[n][3], areaGroup[n][2]);
			}
		}
	   selectSubTop.options[0].selected=true;
}


function selectAreaChange(top,subtop,noteText)
{
		var selectTop=document.getElementById(top);
		var selectSubTop=document.getElementById(subtop);
		for(n = selectSubTop.length - 1; n >=0; n--)		//清空下一级
		{
			selectSubTop.options[n] = null;
		}	
		topValue = selectTop.value;			//获取上一级值			
		selectSubTop.options[selectSubTop.length] = new Option(noteText,"");		
		for (n=0; n<areaGroup.length; n++)
		{
			if(areaGroup[n][0] == topValue)
			{
				selectSubTop.options[selectSubTop.length] = new Option(areaGroup[n][3], areaGroup[n][2]);
			}
		}
	   selectSubTop.options[0].selected=true;
}

function selectCollegeChange(top,subtop)
{
		var selectTop=document.getElementById(top);
		var selectSubTop=document.getElementById(subtop);
		for(n = selectSubTop.length - 1; n >=0; n--)		//清空下一级
		{
			selectSubTop.options[n] = null;
		}	
		topValue = selectTop.value;			//获取上一级值			
		selectSubTop.options[selectSubTop.length] = new Option("请选择","");		
		for (n=0; n<collegeGroup.length; n++)
		{
			if(collegeGroup[n][0] == topValue)
			{
				selectSubTop.options[selectSubTop.length] = new Option(collegeGroup[n][2], collegeGroup[n][1]);
			}
		}
	   selectSubTop.options[0].selected=true;
}


function selectCollegeChange(top,subtop,noteText)
{
		var selectTop=document.getElementById(top);
		var selectSubTop=document.getElementById(subtop);
		for(n = selectSubTop.length - 1; n >=0; n--)		//清空下一级
		{
			selectSubTop.options[n] = null;
		}	
		topValue = selectTop.value;			//获取上一级值			
		selectSubTop.options[selectSubTop.length] = new Option(noteText,"");
		for (n=0; n<collegeGroup.length; n++)
		{
			if(collegeGroup[n][0] == topValue)
			{
				selectSubTop.options[selectSubTop.length] = new Option(collegeGroup[n][2], collegeGroup[n][1]);
			}
		}
	   selectSubTop.options[0].selected=true;
}