grade_name = new Array(35);

grade_name[0] = "";



//北京
grade_name[1] = new Array(0);
grade_name[1][0] = "1年级";
grade_name[1][1] = "2年级";
grade_name[1][2] = "3年级";


//上海
grade_name[2] = new Array(0);
grade_name[2][0]="4年级";
grade_name[2][1]="5年级";
grade_name[2][2]="6年级";



//天津
grade_name[3] = new Array(0);
grade_name[3][0]="7年级";
grade_name[3][1]="8年级";
grade_name[3][2]="9年级";

grade_name[4] = new Array(0);
grade_name[4][0]="高1";
grade_name[4][1]="高2";
grade_name[4][2]="高3";








function combograde(prov,grade)
{
	grade_code = prov.options[prov.selectedIndex].value;

        if(!grade_name[grade_code]) {
           for(i = 1; i < grade.length; i++) {
             grade.options[i].value = "";
             grade.options[i].text = "";
           }
           return;
        }

		grade.options[0].text="请选择";
		if (grade_name[grade_code].length > grade.length-1)
			temp_max=grade_name[grade_code].length
		else
			temp_max=grade.length-1

		for (i=0 ; i < temp_max ; i++)
		{

			if ( ( (i+1)<grade.length ) && ( i < grade_name[grade_code].length )  )
			{
				grade.options[i+1].value=grade_name[grade_code][i];
				grade.options[i+1].text=grade_name[grade_code][i];
			}
			else if ( ( i+1<grade.length ) && (i>=grade_name[grade_code].length) )
			{
				grade.options[i+1].value="";
				grade.options[i+1].text="";
			}
			else
			{
				grade.options[i+1] = new Option("", "", false, false)
				grade.options[i+1].value=grade_name[grade_code][i];
				grade.options[i+1].text=grade_name[grade_code][i];
			}
		}
	grade.selectedIndex=0;
}

function dispProvgrade(prov,city)
{
	document.write('<select name="district3" onchange="combograde(this, district4)"><option value="0">请选择</option><option value="1">预备级</option><option value="2">初级</option><option value="3">中级</option><option value="4">高级</option></select> 年级：<select name="district4"><option value>请选择</option></select>');
	if(prov > 0)
	{
	for(i = 0; i < $("district3").options.length;i++)
	{
		if($("district3").options[i].value == prov)
		{
			$("district3").options[i].selected = true;
			combograde($("district3"),$("district4"));
			for(m = 0; m < $("district4").options.length;m++)
			{
				if($("district4").options[m].value == city)
				{
					$("district4").options[m].selected = true;
					break;
				}
			}
			
			
			break;
		}
	}
	}
}