Need this to be more efficient... Ideas?

[Wolf_22]

I tried to use "getChildNodes" on the following code (and yes, it's ugly), but I couldn't get it to work. But anyway, the following method gets fired when someone clicks on it inside a link and what it does is simply increase font size. Unfortunately, it's only being applied to paragraph and anchor tags. I need anything inside the passed parameter and I'm unsure about how to do this... Ideas?

Here's the code:

function increaseFontSize(n){
    if(!n){
        var p = document.getElementsByTagName('p');
        var a = document.getElementsByTagName('a');
    }else{
        var p = document.getElementById(n).getElementsByTagName('p');
        var a = document.getElementById(n).getElementsByTagName('a');
    }

    for(i=0;i<p.length;i++) {
        if(p[i].style.fontSize) {
            var s = parseInt(p[i].style.fontSize.replace("px",""));
            var z = parseInt(p[i].style.lineHeight.replace("px",""));
        }else{
            var s = 100;
            var z = 100;
        }
        if(s!=max){
            s += 10;
            z += 10;
        }
    p[i].style.fontSize = s+"%";
    p[i].style.lineHeight = z+"%";
    }

    for(i=0;i<a.length;i++) {
        if(a[i].style.fontSize) {
            var b = parseInt(a[i].style.fontSize.replace("px",""));
            var d = parseInt(a[i].style.lineHeight.replace("px",""));
        }else{
            var b = 100;
            var d = 100;
        }
        if(b!=max){
            b += 10;
            d += 10;
        }
    a[i].style.fontSize = b+"%";
    a[i].style.lineHeight = d+"%";
    }

}