function isEmailFormatInCorrect(email)
{
    if (email.charAt(0)=="." ||        
         email.charAt(0)=="@"||       
         email.indexOf('@', 0) == -1 || 
         email.indexOf('.', 0) == -1 || 
         email.lastIndexOf("@")==email.length-1 || 
         email.lastIndexOf(".")==email.length-1)
     {
          return true;
     }

   return false;
} 

function share1() {

	var sendername = document.getElementById("senderName");
	var content = document.getElementById("contentArea");	
	var friendCount = 0;
	var errMsg = "";

	if( sendername.value=='' || sendername.value.length<2 )	 {
		errMsg += '[寄件者]請輸入2個以上中英文字\n';
	}

	for ( var i = 1; i <= 4; i++ ) {
		var friendname=document.getElementById("friendName"+i).value;
		var friendemail=document.getElementById("friendEmail"+i).value;

		if(friendname=='' || friendemail=='' )
			continue;
		friendCount++;
		if(isEmailFormatInCorrect(friendemail))
			errMsg += '[電子信箱]請輸入正確格式的電子信箱\n';
	}
	
	if ( friendCount == 0 ) {
		errMsg += "請輸入至少一組好友暱稱及 Email !\n";
	}
	if( content.value=='' || content.value.length>500)	 {
		errMsg += '[給好友的話]請輸入給好友的話\n';
	}
		
	if (errMsg.length > 0) {
		alert(errMsg);
		return false;
	}
	return true;

};
function share(ccnt) {

	var sendername = document.getElementById("senderName");

	var friendCount = 0;
	var errMsg = "";

	if( sendername.value=='' || sendername.value.length<2 )	 {
		errMsg += '[寄件者]請輸入2個以上中英文字\n';
	}
	
	for ( var i = 1; i <= ccnt; i++ ) {
		var friendname=document.getElementById("friendName"+i).value;
		var friendemail=document.getElementById("friendEmail"+i).value;
		
		if(friendname=='' || friendemail=='' )
			continue;
		friendCount++;
		if(isEmailFormatInCorrect(friendemail))
			errMsg += '[電子信箱]請輸入正確格式的電子信箱\n';
	}
	
	if ( friendCount == 0 ) {
		errMsg += "請輸入至少一組好友暱稱及 Email !\n";
	}
		
	if (errMsg.length > 0) {
		alert(errMsg);
		return false;
	}
	return true;

};
function clearText(){
	var sendername = document.getElementById("senderName");
	var friendname1 = document.getElementById("friendName1");
	var friendname2 = document.getElementById("friendName2");
	var friendname3 = document.getElementById("friendName3");
	var friendname4 = document.getElementById("friendName4");
	var friendemail1 = document.getElementById("friendEmail1");
	var friendemail2 = document.getElementById("friendEmail2");
	var friendemail3 = document.getElementById("friendEmail3");
	var friendemail4 = document.getElementById("friendEmail4");	
	sendername.value='';
	friendname1.value='';
	friendname2.value='';
	friendname3.value='';
	friendname4.value='';
	friendemail1.value='';
	friendemail2.value='';
	friendemail3.value='';
	friendemail4.value='';
};
function clearText1(){

	var friendname1 = document.getElementById("friendName1");
	var friendname2 = document.getElementById("friendName2");
	var friendname3 = document.getElementById("friendName3");
	var friendname4 = document.getElementById("friendName4");
	var friendname5 = document.getElementById("friendName5");
	var friendname6 = document.getElementById("friendName6");
	var friendname7 = document.getElementById("friendName7");
	var friendname8 = document.getElementById("friendName8");
	var friendemail1 = document.getElementById("friendEmail1");
	var friendemail2 = document.getElementById("friendEmail2");
	var friendemail3 = document.getElementById("friendEmail3");
	var friendemail4 = document.getElementById("friendEmail4");	
	var friendemail5 = document.getElementById("friendEmail5");
	var friendemail6 = document.getElementById("friendEmail6");
	var friendemail7 = document.getElementById("friendEmail7");
	var friendemail8 = document.getElementById("friendEmail8");	
	friendname1.value='';
	friendname2.value='';
	friendname3.value='';
	friendname4.value='';
	friendname5.value='';
	friendname6.value='';
	friendname7.value='';
	friendname8.value='';
	friendemail1.value='';
	friendemail2.value='';
	friendemail3.value='';
	friendemail4.value='';
	friendemail5.value='';
	friendemail6.value='';
	friendemail7.value='';
	friendemail8.value='';
};