function setAlaluokat(tol_id){
//nollaa loota
document.yhaku.y_tol_sub.length=0;


//hae valinnanmukaiset tol_tasot pääluokan mukaan
var j;
var sub = new Array;
for(j=0; j<tolArray.length;j++) {
	sub = tolArray[j].split("|");

	if(tol_id == -1) {
		with ( document.yhaku.y_tol_sub){
			document.yhaku.y_tol_sub.options[i] = null;
			document.yhaku.y_tol_sub.length=0;
		}
	}
	else if(sub[0] == tol_id) {
		with ( document.yhaku.y_tol_sub){
			strItem=sub[2] + " | " + sub[1];
			options[length] = new Option( strItem, sub[1] );
		}
	}
}
}