function navshow(idnav) {
	var divs = document.getElementsByTagName( 'div' );
		for ( var i = 0; i < divs.length; i++ ) {
			 if ( 'frm-block' == divs[ i ].className ) {
			  divs[ i ].style.display = 'none';
			 }
	} 

	var showblock = document.getElementById(idnav);
	showblock.style.zIndex= '999';
	showblock.style.display = 'block';	
	over(tm);

}

var tm;
function over(){
    if(tm) {
        clearTimeout(tm);
    }
} 
function navhide(idnav) {
    tm = setTimeout( 'navhiden( "' + idnav + '")',1200);
}
function navhiden(idnav) {
	var showblock = document.getElementById(idnav);
	showblock.parentNode.style.zIndex= '9';
	showblock.style.display = 'none';
}

function rollover(imgID) {
  var thisimg = document.getElementById(imgID);
  thisimg.src = thisimg.src.replace(/(\.[a-z0-9]+)$/i,'_on$1');
}
function rollout(imgID) {
  var thisimg = document.getElementById(imgID);
  thisimg.src = thisimg.src.replace(/_on(\.[a-z0-9]+)$/i,'$1');
}

function out(idnav) {
	tm = setTimeout( 'navhiden( "' + idnav + '")',1200);
}