JS function

<script type="text/javascript" >

function ilov(x,y){
    document.writeln("I love " + x + " and " + y + "<br />")
    }

ilov("FF8","pizza")
ilov("FF7","tatoo")

function sum(x,y)
{alert(x+y)}
sum(3,5)

function sum1(a,b){
    var c=a+b;
    return c;
}

document.writeln(sum1(3,6));
</script>