var ie = (document.all) ? 1 : 0;
var np = (ie) ? "filter" : "MozOpacity";

/* n is the element node
   v is the opacity value, from 0 to 100. */

function objopac(n,v) {
	opac(document.getElementById(n), v);
}

function opac(n,v){
	n.style.opacity = v;
	if(ie) {
	    v = (ie) ? "alpha(opacity="+v*100+")" : v/100;
	    n.style[np] = v;
	}
}