// JavaScript Document

function isSTR(val){
        var str = val;
        // Return false if characters are not a-z, A-Z, or a space.
        for (var i = 0; i < str.length; i++){
                var ch = str.substring(i, i + 1);
                if (((ch < "a" || "z" < ch) && (ch < "A" || "Z" < ch)) && ch != ' '){
                return 1;
                }
        }
        return 0;
}



function user_login_check(){
		var error=0;
		var error_message='Please enter the following information :\n';
	/*if(document.frm_login.user_name.value==''){
		error_msg += 'User name\n';
		error=1;
		}
	if(document.frm_login.user_pwd.value==''){
		error_msg += 'Password\n';
		error=1;
		}*/
	
	    var y_name = document.login_frm.y_name.value;
		var y_email = document.login_frm.y_email.value;
		var f_name = document.login_frm.f_name.value;
		var f_email = document.login_frm.f_email.value;
		var message_sent = document.login_frm.message_sent.value;
	

	//validation for email_friend.php page
	 // Validation for name
        if (y_name == "" || y_name.length < 2 || isSTR(y_name)) { 
                error_message = error_message + "Please enter your name \n";
                error = 1;
        }
		 
	 // Validation for email
        if (y_email == "" || isEmail(y_email)) {
                error_message = error_message + "Please enter your correct email address \n";
                error = 1;
        }
		
		// Validation for name
        if (f_name == "" || f_name.length < 2 || isSTR(f_name)) {
                error_message = error_message + "Please enter your colleagues name \n";
                error = 1;
        }
		
	 // Validation for email
        if (f_email == "" || isEmail(f_email)) {
                error_message = error_message + "Please enter your colleagues correct email address \n";
                error = 1;
        }	

	
	if(error==1) {
		alert (error_message);
		return false;
		}
	else {
		return true;
		}
	}