var onecount;
onecount=0;
subcat = new Array();

subcat[0] = new Array("请选择","1","");

subcat[1] = new Array("请选择","2","");

subcat[2] = new Array("请选择","3","");

subcat[3] = new Array("请选择","4","");

subcat[4] = new Array("请选择","5","");

subcat[5] = new Array("请选择","6","");

subcat[6] = new Array("请选择","7","");

subcat[7] = new Array("请选择","8","");

subcat[8] = new Array("请选择","9","");

subcat[9] = new Array("请选择","10","");

subcat[10] = new Array("出售","10","1");

subcat[11] = new Array("求购","10","2");

subcat[12] = new Array("请选择","11","");

subcat[13] = new Array("请选择","12","");

subcat[14] = new Array("请选择","13","");

subcat[15] = new Array("请选择","14","");

subcat[16] = new Array("请选择","15","");

subcat[17] = new Array("请选择","16","");

subcat[18] = new Array("请选择","17","");

onecount=19;

function changelocation(locationid)
{
    document.myForm.mid.length = 0; 

    var locationid=locationid;
    var i;
    for (i=0;i < onecount;i++)
    {
		if (subcat[i][1] == locationid)
		{
			document.myForm.mid.options[document.myForm.mid.length] = new Option(subcat[i][0], subcat[i][2]);
		}        
     }
}