Javascript Calendar Maker

calendar.js

//function

calendar = function(year,month,template,rowStart,rowEnd,cellStart,cellEnd){

    var tmpl=function(a,b){return a.replace(/\{\{([^{}]+)}}/g,function(c,d){return typeof b[d]=="function"?b[d]():b[d]})}

    return tmpl(template,{
        monthName:"January,February,March,April,May,June,July,August,September,October,November,December".split(",")[month],
        year:year,
        days:function(f,txt,i){
            f   =  (new Date(year,month,1)).getDay()+1
            txt =  ""
            for(i=1;i<[31,(year%4?28:29),31,30,31,30,31,31,30,31,30,31][month]+f;i++){
                txt+=(i%7==1?rowStart:"")+cellStart+(i<f?"":i-f+1)+cellEnd+(i%7==7?rowEnd:"");
            }
            return txt
        }
    });

}
    
//example

document.body.innerHTML=calendar(
    (new Date).getYear()+1900,
    (new Date).getMonth(),
    "\
    <table>                                                 \
        <th colspan=7>{{monthName}} {{year}}</th>           \
        <tr>                                                \
            <td>Sun</td>                                    \
            <td>Mon</td>                                    \
            <td>Tue</td>                                    \
            <td>Wed</td>                                    \
            <td>Thu</td>                                    \
            <td>Fri</td>                                    \
            <td>Sat</td>                                    \
        </tr>                                               \
        {{days}}                                            \
    </table>                                                \
    ",
    "<tr>","</tr>","<td>","</td>"
);

​