if (isJsEnabled()) {
    addLoadEvent(disableDefaults);
}

function disableDefaults() {
    document.getElementById("edit-attachment_file_a").disabled = true;	
    document.getElementById("edit-attachment_file_b").disabled = true;	
	document.getElementById("edit-attachment_file_c").disabled = true;	
    document.getElementById("edit-attachment_file_d").disabled = true;	
}

function toggle_attachment_file_a() {

    if ( document.getElementById("edit-attachment_file").onchange ) {
    	document.getElementById("edit-attachment_file_a").disabled = false;	
    } else {
		disableDefaults();
    }
		    
}

function toggle_attachment_file_b() {

    if ( document.getElementById("edit-attachment_file").onchange ) {
    	document.getElementById("edit-attachment_file_b").disabled = false;	
    } else {
		disableDefaults();
    }
		    
}

function toggle_attachment_file_c() {

    if ( document.getElementById("edit-attachment_file").onchange ) {	
		document.getElementById("edit-attachment_file_c").disabled = false;	
    } else {
		disableDefaults();
    }
		    
}

function toggle_attachment_file_d() {

    if ( document.getElementById("edit-attachment_file").onchange ) {
    	document.getElementById("edit-attachment_file_d").disabled = false;
    } else {
		disableDefaults();
    }
		    
}