Is there a way to getElement xml by attribute?

I feel this justifies a new answer as it is JQuery Free

document.getElementsByAttribute = function(attribute, value, tagName, parentElement) {
    var children = ($(parentElement) || document.body).getElementsByTagName((tagName || '*'));
    return $A(children).inject([], function(elements, child) {
        var attributeValue = child.getAttribute(attribute);
        if(attributeValue != null) {
            if(!value || attributeValue == value) {
                elements.push(child);
            }
        }
        return elements;
    });
}

source

it has been pointed out to me that I posted the wrong script.. hehe read here

// document.getElementsByAttribute([string attributeName],[string attributeValue],[boolean isCommaHyphenOrSpaceSeparatedList:false])
document.getElementsByAttribute=function(attrN,attrV,multi){
    attrV=attrV.replace(/\|/g,'\\|').replace(/\[/g,'\\[').replace(/\(/g,'\\(').replace(/\+/g,'\\+').replace(/\./g,'\\.').replace(/\*/g,'\\*').replace(/\?/g,'\\?').replace(/\//g,'\\/');
    var
        multi=typeof multi!='undefined'?
            multi:
            false,
        cIterate=document.getElementsByTagName('*'),
        aResponse=[],
        attr,
        re=new RegExp(multi?'\\b'+attrV+'\\b':'^'+attrV+'$'),
        i=0,
        elm;
    while((elm=cIterate.item(i++))){
        attr=elm.getAttributeNode(attrN);
        if(attr &&
            attr.specified &&
            re.test(attr.value)
        )
            aResponse.push(elm);
    }
    return aResponse;
}