/*
Strip whitespace from the beginning and end of a string
Input : a string
*/
function trim(str)
{
	return str.replace(/^\s+|\s+$/g,'');
}

/*
Make sure that textBox only contain number
*/
function checkNumber(textBox)
{
	while (textBox.value.length > 0 && isNaN(textBox.value)) {
		textBox.value = textBox.value.substring(0, textBox.value.length - 1)
	}
	
	textBox.value = trim(textBox.value);
/*	if (textBox.value.length == 0) {
		textBox.value = 0;		
	} else {
		textBox.value = parseInt(textBox.value);
	}*/
}

/*
	Check if a form element is empty.
	If it is display an alert box and focus
	on the element
*/
function isEmpty(formElement, message) {
	formElement.value = trim(formElement.value);
	
	_isEmpty = false;
	if (formElement.value == '') {
		_isEmpty = true;
		alert(message);
		formElement.focus();
	}
	
	return _isEmpty;
}

/*
	Set one value in combo box as the selected value
*/
function setSelect(listElement, listValue)
{
	for (i=0; i < listElement.options.length; i++) {
		if (listElement.options[i].value == listValue)	{
			listElement.selectedIndex = i;
		}
	}	
}


var numChars="0123456789";
var EmailChk="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ@-_.";
var error;
var isEmail=true;
function reset_error()
{
error_email=false;
errormsg='';
}
function validate_Email(){
    if(isEmail){
        if(document.main.scriptmail.value==""){
            errormsg+='Please fill up the Email Section.\n';
            error_email=true;
        }
        if(!error_email){
            var mail=/[-a-zA-Z0-9_\.]+@[-a-zA-Z0-9]+\.[-a-zA-Z0-9\.]+/;
            var eflag = document.main.scriptmail.value.match(mail);
            if(eflag!=document.main.scriptmail.value){    
                errormsg+='Your Email address is not correct.\n';
                error_email=true;
            }
        }
    }
    
    if(!error_email){
        for(var i=0; i<document.main.scriptmail.value.length; i++){
            for(var j=0; j<EmailChk.length; j++){
                if(EmailChk.charAt(j)==document.main.scriptmail.value.charAt(i)){
                    break;
                }else{
                    if((j==(EmailChk.length-1))&&(i==(document.main.scriptmail.value.length-1))){
                        errormsg+='Your Email address is not correct.\n';
                        error_email=true;
                    }
                }
            }
        }
    }
    if(!error_email){
        if(document.main.scriptmail.value.indexOf(unescape("%27")) != -1){
            errormsg+='Your Email is not correct.\n';
            error_email=true;
        }
    }
    if(!error_email){
        if(document.main.scriptmail.value.indexOf(unescape("%22")) != -1){
            errormsg+='Your Email is not correct.\n';
            error_email=true;
        }
    }
}
function validate(){
	
	reset_error();
	validate_Email();
	
	if(error_email){
		error=true;
	}else{
		error=false;
	}
	if(!error){
		document.main.submit();
	}else{
		alert(errormsg);
	}
}