function CheckForm(frm){
    return true;
}
function convertISBN2EAN(isbn){
    isbn = isbn.replace(/-/g,"");
    isbn = isbn.replace(/\s/g,"");    
    if(isbn.length!=10){        
        alert('ISBN should contain exaclty 10 digits!');        
        return false;    
    }                                                               
    var ean = '978'+isbn;    
    ean = ean.substr(0,ean.length-1);    
    ean = ean + CalculateEAN13Checksum(ean);    
    jQuery('#sbook_ean').attr('value',ean);
    //location.href='/bookfinder/ean/'+ean;
}

function CalculateEAN13Checksum(messageString){ 
    var csumTotal = 0; // The checksum working variable starts at zero 
    var checkDigit = 0; // If the source message string is less than 12 characters long, we make it 12 characters 
    if( messageString.length < 12 )  {  
        var holdString = '000000000000' + messageString;  
        messageString = holdString.substring(holdString.length - 12, holdString.length);  
    } // Calculate the checksum value for the message 
    
    for( charPos = messageString.length - 1; charPos >= 0; charPos--)   {  
        if( charPos / 2 == parseInt(charPos/2) )   
            csumTotal = csumTotal + (parseInt(messageString.substring(charPos,charPos+1)));  
        else   
            csumTotal = csumTotal + (3 * parseInt(messageString.substring(charPos,charPos+1)));  
    } // Calculate the checksum digit 
    var remainder = csumTotal - parseInt(csumTotal/10) * 10; 
    if( remainder != 0 )  
        checkDigit = 10 - remainder; 
    return checkDigit; 
}    
// Setup Find criteria for Find Book
function SetFindType(critstr){    
    var BookFindType = document.getElementById("b-findtype");
    BookFindType.value = critstr
}
function SearchVar(){    
    var DataCrit = document.getElementById("criteria");    
    var DataAuthor = document.getElementById("b-author");    
    var DataTitle = document.getElementById("b-title");    
    var DataEAN = document.getElementById("b-ean");    
    var BookFindType=document.getElementById("b-findtype");        
    if( BookFindType.value == 'ean'){        
        DataEAN.value=DataCrit.value;            
    } else if(BookFindType.value == 'aut'){        
        DataTitle.value=DataCrit.value;                
        DataAuthor.value=DataCrit.value;    
    } else{
        DataTitle.value=DataCrit.value;                
    }
}