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

function blendimage(divid, imageid, ii, millisec) { 
	switch (imageCounter % 3) {
		case 0: imagefile = 'images/beach957.jpg'; break;
		case 1: imagefile = 'images/class_pic_550.jpg'; break;
		default: imagefile = 'images/OakMesaSoars1.JPG';
	}
	imageCounter = eval(ii + 1);
	//f = alert(divid + " " + imageid + " " + imagefile);	
    var speed = Math.round(millisec / 100); 
    var timer = 0; 
    //set the current image as background 

    //document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")"; 
     
    //make image transparent 
    changeOpac(0, imageid);
     
    //make new image 
    document.getElementById(imageid).src = imagefile; 

    //fade in image 
    for(i = 0; i <= 100; i++) { 
        setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed)); 
        timer++; 
    } 
    var t=setTimeout("blendimage('mainpagediv','mainpageimg',imageCounter,500)",6000);
}