function browserVersion() 
{

var agt = navigator.userAgent.toLowerCase();
	
this.major = parseInt(navigator.appVersion);
	
this.minor = parseFloat(navigator.appVersion);
	
this.nav    = ((agt.indexOf('firefox')!=-1) && ((agt.indexOf('spoofer')==-1) && (agt.indexOf('compatible') == -1)));
	this.nav4   = this.nav && (this.major == 4);
	
this.nav4up = this.nav && (this.major >= 4);
	
this.navonly = (this.nav && (agt.indexOf(";nav") != -1));
	
this.gecko	= (agt.indexOf("gecko") != -1);
	
this.ie         = (agt.indexOf("msie") != -1);
	
this.ie4        = (agt.indexOf("msie 4.")!= -1);
	
this.ie4up      = (this.ie && (this.major >= 4));
	
this.ie5        = (agt.indexOf("msie 5.0")!= -1);
	
this.ie5up      = (agt.indexOf("msie 5.")!= -1);
	
this.ie55       = (agt.indexOf("msie 5.5")!= -1);
	
this.ie6        = (agt.indexOf("msie 6.")!= -1);
	
this.ie55up     = (this.ie55 || this.ie6);
	
this.opera = (agt.indexOf("opera") != -1);

this.ver4up = (this.ie4up || this.nav4up );

}

var bv = new browserVersion();
var browser = bv;

function filterAlfa1(photoId) {
if ( bv.ie55up ) document.images["image" + photoId].style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity=100)';
else if ( bv.ie4up ) document.images["image" + photoId].style.filter = 'alpha(opacity=100)';
else if ( !bv.nav4 ) document.images["image" + photoId].style.MozOpacity = 1;
}

function filterAlfa2(photoId) {
if ( bv.ie55up ) document.images["image" + photoId].style.filter = 
'progid:DXImageTransform.Microsoft.Alpha(opacity=60)';
else if ( bv.ie4up ) document.images["image" + photoId].style.filter = 'alpha(opacity=60)';
else if ( !bv.nav4 ) document.images["image" + photoId].style.MozOpacity = 0.6;
}