function OnMouseOverRowsNav() {
    // for every table row ...
	var rows = document.getElementsByTagName('tr');
	for ( var i = 0; i < rows.length; i++ ) {
	    // ... with the class 'odd' or 'even' ...
		if ( 'odd' != rows[i].className && 'naveven' != rows[i].className ) {
		    continue;
		}
	    // ... add event listeners ...
        // ... to highlight the row on mouseover ...
	    if ( navigator.appName == 'Microsoft Internet Explorer' ) {
	        // but only for IE, other browsers are handled by :hover in css
			rows[i].onmouseover = function() {
			    this.className += ' hover';
			}
			rows[i].onmouseout = function() {
			    this.className = this.className.replace( ' hover', '' );
			}
	    }
        // ... and to mark the row on click ...
		rows[i].onmousedown = function() {
		    var unique_id;
            var checkbox;

            checkbox = this.getElementsByTagName( 'input' )[0];
            if ( checkbox && checkbox.type == 'checkbox' ) {
                unique_id = checkbox.name + checkbox.value;
            } else if ( this.id.length > 0 ) {
                unique_id = this.id;
            } else {
		        return;
		    }

            if ( typeof(marked_row[unique_id]) == 'undefined' || !marked_row[unique_id] ) {
                marked_row[unique_id] = true;
            } else {
                marked_row[unique_id] = false;
            }

            if ( marked_row[unique_id] ) {
			    this.className += ' marked';
            } else {
			    this.className = this.className.replace(' marked', '');
            }

            if ( checkbox && checkbox.disabled == false ) {
                checkbox.checked = marked_row[unique_id];
            }
		}

		// ... and disable label ...
		var labeltag = rows[i].getElementsByTagName('label')[0];
		if ( labeltag ) {
		    labeltag.onclick = function() {
		        return false;
		    }
	    }
	    // .. and checkbox clicks
		var checkbox = rows[i].getElementsByTagName('input')[0];
		if ( checkbox ) {
		    checkbox.onclick = function() {
		        // opera does not recognize return false;
		        this.checked = ! this.checked;
		    }
	    }
	}
}
window.onload=OnMouseOverRowsNav;