var text_grades = new Array( "เฉยๆ", "พอใช้", "สวยดี", "เยี่ยม", "สุดยอด", "" );
var im1 = "images/star/s1.gif";
var im2 = "images/star/s3.gif";

function writit(text,id) {
	if(document.getElementById) {
		x = document.getElementById(id);
		x.innerHTML = '';
		// x.innerHTML = text;
	}
	else if(document.all) {
		x = document.all[id];
		// x.innerHTML = text;
	}
	else if(document.layers) {
		x = document.layers[id];
		text2 = '<p class="testclass">' + text + '</p>';
		x.document.open();
		// x.document.write(text2);
		x.document.close();
	}
}

function change_stars(star_num) {
	switch(star_num) {
		case 0:
			doRestore();
			document.images["Image0"].src = im1;
			break;
		case 1:
			doRestore();
			document.images["Image0"].src = im1;
			document.images["Image1"].src = im1;
			break;
		case 2:
			doRestore();
			document.images["Image0"].src = im1;
			document.images["Image1"].src = im1;
			document.images["Image2"].src = im1;
			break;
		case 3:
			doRestore();
			document.images["Image0"].src = im1;
			document.images["Image1"].src = im1;
			document.images["Image2"].src = im1;
			document.images["Image3"].src = im1;
			break;
		case 4:
			doRestore();
			document.images["Image0"].src = im1;
			document.images["Image1"].src = im1;
			document.images["Image2"].src = im1;
			document.images["Image3"].src = im1;
			document.images["Image4"].src = im1;
			break;
	}
    writit(text_grades[star_num], 'text_grade');	
	return true;
}


function doRestore() {
	var i, restore_by;
	restore_by = window.document.form_rate.rate.value; 
	
	if(restore_by == '') { 
		// restore_by = 0;
		// window.document.form_rate.rate.value = 0;
		document.images["Image0"].src = im2;
		document.images["Image1"].src = im2;
		document.images["Image2"].src = im2;
		document.images["Image3"].src = im2;
		document.images["Image4"].src = im2;
		writit('','text_grade');
	}
	else {
		for(i=4;i>restore_by;i--) {
			document.images["Image"+i].src = im2;
		}
	 
		writit(text_grades[window.document.form_rate.rate.value],'text_grade');
	}
}