//設定圖片的透明度 0.0 ~ 1.0
function setOpacity(objId,n) {
	if (document.all){
		$(objId).filters[0].opacity = n * 100;
	} else {
		$(objId).style.MozOpacity = n;
	}
}

function isNumber(fieldName,desc){
	if (isNaN(fieldName)){
		alert("["+ desc + "] 欄位必須是數字,請重新輸入!!");		
		return false;
	}
	if ( fieldName.length == 0 ) {
		alert("["+ desc + "] 欄位不可輸入空白(可輸入 0 )，請重新輸入!!");		
		return false;
	}
	return true;
}

function isAscii(sender,ctext){
	var checkstring = " -=\\[];,./~!@#$%^&*()_+|{}:\? ";
	var slen = sender.length;
  	var strtmp = sender.toUpperCase();
	for(var i=0; i<slen; i++){
		var c = strtmp.charAt(i);
		if(!(c >= "0" && c <= "9") && !(c >= "A" && c <= "Z") && (checkstring.indexOf(c,0) == -1)){
				alert("["+ctext+"] 欄位必須是英數字母,請重新輸入!!");		
				return false;
		}
	}
		return true;
}

function isEmpty(fieldName,desc){
	if (trim(fieldName).length == 0){
		alert("["+ desc + "] 欄位必須輸入");		
		return false;
	}
	return true;
}

function trimR(sender)	{
	len = sender.length;
	while ((len > 0) && (sender.charAt(len - 1) <= ' '))
		len--;
	return sender.substring(0, len);
}

function trimL(sender)	{
	len = 0;
	while ((len < sender.length) && (sender.charAt(len) <= ' '))
		len++;
	return sender.substring(len,sender.length);
}

function trim(sender)	{
	sender = trimR(sender);
	return trimL(sender);
}

function isJPG(sender,ctext,desc){
	var pos ;
	sender = sender.toUpperCase();
	ctext = ctext.toUpperCase();
	if ( sender == ""  ) return true;
	pos = -1;
	pos = sender.indexOf(ctext);
	if( pos == -1 ){
		alert("["+desc+"] 欄位輸入錯誤，只可以傳送 ["+ctext + "] 格式的檔案，請重新輸入！");
		return false;
	}
	return true;
}


function isEmail(fieldName,desc){
	if(fieldName.length>0) {	// 有輸入才檢查
		if (fieldName.indexOf('@')<1 || 
		fieldName.indexOf('.')==-1 || 
		fieldName.indexOf('@') != fieldName.lastIndexOf('@')){
		alert("["+ desc + "] 欄位必須是正確的Email,請重新輸入!!");
			 return false;
		}
	}
	return true;
}