//ISBN CHECKER FOR SEARCH
function isbn_check(iField) {
		iField = iField.replace(/-/g, '')
		var iLength = iField.length;
		var isbn_status = document.getElementById('isbn_status');
		var searchBtn = document.getElementById('search');
	if(iLength == 10 || iLength > 12){
		isbn_regex = /^((978|979)\d{9}[\d|X])$|^(\d{9}[\d|X])$/i;
		if(!isbn_regex.test(iField) || iField.length > 13){
			isbn_status.innerHTML="(" + iLength + ") Invalid ISBN.";
			isbn_status.className="status_red";
			searchBtn.disabled=true;
		} else {
			isbn_status.innerHTML="(" + iLength + ") Valid ISBN.";
			isbn_status.className="status_green";
			searchBtn.disabled=false;
		}
	} else {
		isbn_status.innerHTML="(" + iLength + ")";
		isbn_status.className="status_black";
		searchBtn.disabled=true;
	}
}


//ISBN CHECKER FOR SELL
function isbn_verify(iField, iId, iSpan) {
		var iLength = iField.length
		var isbn_status = document.getElementById('isbn_status')
		var searchBtn = document.getElementById('search')
	if(iLength == 10 || iLength == 13){
		isbn_regex = /^((978|979)\d{9}[\d|X])$|^(\d{9}[\d|X])$/i
		if(!isbn_regex.test(iField)){
			isbn_status.innerHTML="(" + iLength + ") Invalid ISBN."
			isbn_status.className="status_red"
			searchBtn.disabled=false
		} else {
			isbn_status.innerHTML="(" + iLength + ") Valid ISBN."
			isbn_status.className="status_green"
			searchBtn.disabled=false
		}
	} else {
		isbn_status.innerHTML="(" + iLength + ") ISBN must be 10 or 13 characters."
		isbn_status.className="status_black"
		searchBtn.disabled=false
	}
}