var browsername = navigator.userAgent.toLowerCase();
var isFF = browsername.indexOf('firefox')!=-1;

var griddivs = ['div11', 'div12', 'div13', 'div14', 'div21', 'div22', 'div23', 'div24', 'div25',
				'div31', 'div32', 'div33', 'div34'];

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

function fadein(nofade, tohide, color, bk, topcorrect){

	var stLight = document.getElementById(nofade).style;
	if(bk){
		//stLight.backgroundColor = color;
		stLight.borderColor = color;
	}
	else{
		stLight.color = color;
		stLight.borderColor = color;
	}
	
	for(i = 0; i < 13; i++){
		if(griddivs[i] != nofade){
			changeOpacity(50, griddivs[i]);
		}
	}
	
	var stDivToShow = document.getElementById(tohide).style; 
	if(isFF){
		stDivToShow.top = topcorrect;
	}

	stDivToShow.visibility = 'visible';
		

} // fadein

function fadeout(nofade, toshow, color, bk){

	var stLight = document.getElementById(nofade).style;
	if(bk){
		//stLight.backgroundColor = color;
		stLight.borderColor = color;
	}
	else{
		stLight.color = color;
		stLight.borderColor = color;
	}

	for(i = 0; i < 13; i++){
		if(griddivs[i] != nofade){
			changeOpacity(100, griddivs[i]);
		}
	}
	
	var stDivToHide = document.getElementById(toshow).style; 
	stDivToHide.visibility = 'hidden';

} // fadeout