var previousTab = 1;
var previousBlurb = 1;
var links = new Array("insite.htm","technology.htm","inweb.htm","news.htm","contact.htm");

function showBlurb(id) {

	if(previousBlurb) { 
		fadeInOut("blurb"+id, "blurb"+previousBlurb);
		setBackgroundImg(previousBlurb, "closed");
		setBackgroundImg(id, "open")
		previousBlurb = id;
	} else {
		previousBlurb = id;
		setOpacity(id, 10);
		setBackgroundImg(id, "open")
		fadeIn("blurb"+ id);
	}
}

function tabHighlight(id) {
	
	if(previousTab) { 
		setOpacity(previousTab, 7);
		setOpacity(id, 10);
		previousTab = id;
	} else {
		previousTab = id;
		setOpacity(id, 10);
	}	
}

function setBackgroundImg (objid, value) {
	
document.getElementById(objid).style.backgroundImage = 'url(picts/'+value+'tab.jpg)';	
	
}

function setOpacity(objid, value) {

document.getElementById(objid).style.opacity = value/10;
document.getElementById(objid).style.filter = 'alpha(opacity=' + value*10 + ')'; 

}
function fadeIn(obid) {

for (var i=0;i<=10;i++) {
	
	setTimeout('setOpacity('+'"'+obid+'"'+', '+i+')',50*i);
	
	}
	return false;
}

function fadeInOut(inid, outid) {
	var speed = 30;
	if(inid != outid)	{	
		for (var i=0;i<=10;i++) {
			setTimeout('setOpacity('+'"'+inid+'"'+', '+i+')',speed*i);
			setTimeout('setOpacity('+'"'+outid+'"'+', '+(10-i)+')',speed*i);
		}
	}
	return false;
}

function fadeOut(obid) {

for (var i=10;i>1;i--) {
	
	setTimeout('setOpacity('+'"'+obid+'"'+', '+i+')',50*i);
	
	}
	return false;
}

function getPage() {
	if (previous) window.location = links[previous - 1];
}