GetElementsByClassName(tagArray, ClassNameArray)

usage:

var t = new Array('a','span','font');
var tc = new Array('className1','className2')
var arr = getElementsByClassName(t,tc);


function:

function getElementsByClassName(T,TC){
var c=0; var rs = new Array();
for(i=0;i<T.length;i++){
for(j=0;j<TC.length;j++){
var tOBJ = document.getElementsByTagName(T[i]);
for(h=0;h<tOBJ.length;h++){
if(tOBJ[h].getAttribute('class') == TC[j]){
rs[c]=tOBJ[h];
c++;
}
}
}
}
return rs;
}