var win = null;

	function NewWindow(mypage,myname,w,h,scroll) {
		LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
		TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
		settings =
		'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable'
		win = window.open(mypage,myname,settings)
	}
	
	function sha1Hash(msg) {
	    // constants [§4.2.1]
	    var K = [0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6];
	
	    // PREPROCESSING 
	 
	    msg += String.fromCharCode(0x80);  // add trailing '1' bit to string [§5.1.1]
	
	    // convert string msg into 512-bit/16-integer blocks arrays of ints [§5.2.1]
	    var l = Math.ceil(msg.length/4) + 2;  // long enough to contain msg plus 2-word length
	    var N = Math.ceil(l/16);              // in N 16-int blocks
	    var M = new Array(N);
	
	    for (var i=0; i<N; i++) {
	        M[i] = new Array(16);
	        for (var j=0; j<16; j++) {  // encode 4 chars per integer, big-endian encoding
	            M[i][j] = (msg.charCodeAt(i*64+j*4)<<24) | (msg.charCodeAt(i*64+j*4+1)<<16) | 
	                      (msg.charCodeAt(i*64+j*4+2)<<8) | (msg.charCodeAt(i*64+j*4+3));
	        } // note running off the end of msg is ok 'cos bitwise ops on NaN return 0
	    }
	    // add length (in bits) into final pair of 32-bit integers (big-endian) [§5.1.1]
	    // note: most significant word would be ((len-1)*8 >>> 32, but since JS converts
	    // bitwise-op args to 32 bits, we need to simulate this by arithmetic operators
	    M[N-1][14] = ((msg.length-1)*8) / Math.pow(2, 32); M[N-1][14] = Math.floor(M[N-1][14])
	    M[N-1][15] = ((msg.length-1)*8) & 0xffffffff;
	
	    // set initial hash value [§5.3.1]
	    var H0 = 0x67452301;
	    var H1 = 0xefcdab89;
	    var H2 = 0x98badcfe;
	    var H3 = 0x10325476;
	    var H4 = 0xc3d2e1f0;
	
	    // HASH COMPUTATION [§6.1.2]
	
	    var W = new Array(80); var a, b, c, d, e;
	    for (var i=0; i<N; i++) {
	
	        // 1 - prepare message schedule 'W'
	        for (var t=0;  t<16; t++) W[t] = M[i][t];
	        for (var t=16; t<80; t++) W[t] = ROTL(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16], 1);
	
	        // 2 - initialise five working variables a, b, c, d, e with previous hash value
	        a = H0; b = H1; c = H2; d = H3; e = H4;
	
	        // 3 - main loop
	        for (var t=0; t<80; t++) {
	            var s = Math.floor(t/20); // seq for blocks of 'f' functions and 'K' constants
	            var T = (ROTL(a,5) + f(s,b,c,d) + e + K[s] + W[t]) & 0xffffffff;
	            e = d;
	            d = c;
	            c = ROTL(b, 30);
	            b = a;
	            a = T;
	        }
	
	        // 4 - compute the new intermediate hash value
	        H0 = (H0+a) & 0xffffffff;  // note 'addition modulo 2^32'
	        H1 = (H1+b) & 0xffffffff; 
	        H2 = (H2+c) & 0xffffffff; 
	        H3 = (H3+d) & 0xffffffff; 
	        H4 = (H4+e) & 0xffffffff;
	    }
	
	    return H0.toHexStr() + H1.toHexStr() + H2.toHexStr() + H3.toHexStr() + H4.toHexStr();
	}
	
	//
	// function 'f' [§4.1.1]
	//
	function f(s, x, y, z) {
	    switch (s) {
	    case 0: return (x & y) ^ (~x & z);           // Ch()
	    case 1: return x ^ y ^ z;                    // Parity()
	    case 2: return (x & y) ^ (x & z) ^ (y & z);  // Maj()
	    case 3: return x ^ y ^ z;                    // Parity()
	    }
	}
	
	//
	// rotate left (circular left shift) value x by n positions [§3.2.5]
	//
	function ROTL(x, n) {
	    return (x<<n) | (x>>>(32-n));
	}
	
	//
	// extend Number class with a tailored hex-string method 
	//   (note toString(16) is implementation-dependant, and  
	//   in IE returns signed numbers when used on full words)
	//
	Number.prototype.toHexStr = function() {
	    var s="", v;
	    for (var i=7; i>=0; i--) { v = (this>>>(i*4)) & 0xf; s += v.toString(16); }
	    return s;
	}

	function initPay() {
		var d = new Date();
		date = d.getDate() +''+ d.getMonth() + ''+d.getFullYear() + '/' + d.getHours() + '' + d.getMinutes() + '' + d.getSeconds();
		document.getElementById('orderID').value = date;
			
		px = null;
		    
	    if(px!=null) {	
	    	document.getElementById('price').value = px;
	    	document.getElementById('amount').value = px * document.getElementById('multiplicator').value;
	    }	
	    
	    setSha();
	}
		    
    function setSha() {
    		document.getElementById('SHASign').value = sha1Hash( document.getElementById('orderID').value + document.getElementById('amount').value + document.getElementById('currency').value + document.getElementById('PSPID').value + 'djmanu' );	
    }
    
	function setPrice(action) {
		document.getElementById('multiplicator').value = 100;
		document.getElementById('form1').target = null;	
		document.getElementById('amount').value = parseInt(document.getElementById('amount_').value) * document.getElementById('multiplicator').value; 	
		setSha();
	}