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2150 mathias 1 
if(!dojo._hasResource["dojox.validate.isbn"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojox.validate.isbn"] = true;
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dojo.provide("dojox.validate.isbn");
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dojox.validate.isValidIsbn = function(/* String */value) {
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	// summary: Vadlidate ISBN-10 or ISBN-13 based on the length of value
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	// returns: Boolean
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	var len, sum, weight;
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	if(typeof value!='string'){
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		value = String(value);
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	}
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	value = value.replace(/[- ]/g,''); //ignore dashes and whitespaces
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	len = value.length;
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	sum = 0;
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	if(len == 10){
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		weight = 10;
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		// ISBN-10 validation algorithm
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		for(var i = 0; i< 9; i++){
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			sum += parseInt(value.charAt(i)) * weight;
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			weight --;
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		}
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		var t = value.charAt(9).toUpperCase();
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		sum += t == 'X' ? 10 : parseInt(t);
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		return sum % 11 == 0;
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	}else if(len == 13) {
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		weight = -1;
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		for(var i=0; i< len; i++){
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			sum += parseInt(value.charAt(i)) * (2 + weight);
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			weight *= -1;
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		}
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		return sum % 10 == 0;
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	}else{
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		return false;
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	}
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}
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}