function hide( id ) {
    document.getElementById( id ).style.display='none' ;
}


function show( id ) {
    document.getElementById( id ).style.display='' ;
}


function changeOpac(id, opacity) {
    var object = document.getElementById(id).style;
    //object.opacity = (opacity / 100);
    //object.MozOpacity = (opacity / 100);
    //object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
}


function browserDetect() {
	var version = navigator.userAgent ;
	if( version.indexOf('Firefox')!=-1 ) {
		return 'firefox' ;
	} else if( version.indexOf('MSIE 6')!=-1 ) {
		return 'ie6' ;
	} else if( version.indexOf('MSIE 7')!=-1 ) {
		return 'ie7' ;
	} else if( version.indexOf('Opera')!=-1 ) {
		return 'opera' ;
	}
}

function browserCompatibility() {
	if( browserDetect()=='ie6' || browserDetect()=='ie7' ) {
		document.getElementById('transparent_layer').style.width='110%' ;
		document.body.style.overflowX='hidden' ;
	}
}

function bringToFront( id ) {
    var object = document.getElementById(id) ;
    object.style.zIndex=1000 ;
}