function doOpac(param){
	if(param==1){
		document.getElementById("opac").style.opacity = ".3";
		document.getElementById("opac").style.filter = "alpha(opacity=30)";
	}else{
		document.getElementById("opac").style.opacity = "1";
		document.getElementById("opac").style.filter = "alpha(opacity=100)";
	}
}