// Javascript version of php str_replace

function str_replace ( search, replace, subject )
{

    if(!(replace instanceof Array)){
        replace=new Array(replace);
        if(search instanceof Array){
        //If search is an array and replace is a string, then this replacement string is used for every value of search
            while(search.length>replace.length){
                replace[replace.length]=replace[0];
            }
        }
    }

    if(!(search instanceof Array))search=new Array(search);
    while(search.length>replace.length){//If replace    has fewer values than search , then an empty string is used for the rest of replacement values
        replace[replace.length]='';
    }

    if(subject instanceof Array){
    //If subject is an array, then the search and replace is performed with every entry of subject , and the return value is an array as well.
        for(k in subject){
            subject[k]=str_replace(search,replace,subject[k]);
        }
        return subject;
    }

    for(var k=0; k<search.length; k++){
        var i = subject.indexOf(search[k]);
        while(i>-1){
            subject = subject.replace(search[k], replace[k]);
            i = subject.indexOf(search[k],i);
        }
    }

    return subject;

}