if (document.images) {
	rollOvers = 1;
} else {
    rollOvers = 0;
}
        
if (rollOvers)
{

nav_email_ON = new Image(192,7);
nav_email_ON.src ="images/nav_email_on.gif";
nav_email_OFF = new Image(192,7);
nav_email_OFF.src = "images/nav_email_off.gif";


}

var imageOn;

function imgOn( imgName ) {
	if ( rollOvers ) {
		document[imgName].src = eval( "nav_" + imgName + "_ON.src" );
	}
}

function imgOff( imgName ) {
	if ( rollOvers ) {
		document[imgName].src = eval( "nav_" + imgName + "_OFF.src" );
	}
}