// JavaScript Document

///////////////////////////////////////////////////// pop up functions /////////////////////////////////////////////////////

function toggle(div_id) {
	var el = document.getElementById(div_id);
	if ( el.style.display == 'none' ) {	el.style.display = 'block';}
	else {el.style.display = 'none';}
}
function blanket_size(popUpDivVar) {
	if (typeof window.innerWidth != 'undefined') {
		viewportheight = window.innerHeight;
	} else {
		viewportheight = document.documentElement.clientHeight;
	}
	if ((viewportheight > document.body.parentNode.scrollHeight) && (viewportheight > document.body.parentNode.clientHeight)) {
		blanket_height = viewportheight;
	} else {
		if (document.body.parentNode.clientHeight > document.body.parentNode.scrollHeight) {
			blanket_height = document.body.parentNode.clientHeight;
		} else {
			blanket_height = document.body.parentNode.scrollHeight;
		}
	}
	var blanket = document.getElementById('blanket');
	blanket.style.height = blanket_height + 'px';
	var popUpDiv = document.getElementById(popUpDivVar);
	popUpDiv_height=100;
	popUpDiv.style.top = popUpDiv_height + 'px';
}
function window_pos(popUpDivVar) {
	if (typeof window.innerWidth != 'undefined') {
		viewportwidth = window.innerHeight;
	} else {
		viewportwidth = document.documentElement.clientHeight;
	}
	if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
		window_width = viewportwidth;
	} else {
		if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
			window_width = document.body.parentNode.clientWidth;
		} else {
			window_width = document.body.parentNode.scrollWidth;
		}
	}
	var popUpDiv = document.getElementById(popUpDivVar);
	window_width=window_width/2-200; // * * * half popup's width * * *
	popUpDiv.style.left = window_width + 'px';
}
function popup(windowname) {
	blanket_size(windowname);
	window_pos(windowname);
	toggle('blanket');
	toggle(windowname);		
}

///////////////////////////////////////////////////// cartridgedb functions /////////////////////////////////////////////////////

		var phonogain = 40;
		var armm = 0;
		
		function vcalc(cart, cartv)
		{
			//var tmp1 = window.prompt("Integrated Voltage Gain Calculator: Enter the gain of you phono preamp (in db)","  ");
			phonogain = window.prompt("Voltage Gain Calculator: Enter the gain of you phono preamp (in db)",phonogain);
			if (parseFloat(phonogain) > 0 && parseFloat(cartv) > 0)
			{
				var origgain = phonogain;
				phonogain = parseFloat(phonogain)/20;
				var res = 0
				res = parseFloat(cartv) * Math.pow(10,phonogain);
				res = Math.round(res);
				alert("The " + cart + " output voltage of " + cartv + "mv with a gain of " + origgain + "db would yield: " + res + "mv");
				phonogain = origgain;
			}
			
		}
		function rcalc(cart,cartc,cartw)
		{
			var dest = "";
			dest = "http://www.cartridgedb.com/resonance_from_cart.asp?cdesc=" + cart + "&cmass=" + cartw + "&ccomp="+ cartc;
			window.open(dest);
			}