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/* This script and many more are available free online at
The JavaScript Source :: http://javascript.internet.com

var sixteen;
var one;
var red;
var green;
var blue;
var colorCode;
var inputType = “dec”;

var ralpha = “0123456789ABCDEF”;
var temppos;
var rnumber;
hexArray = new Array();
hexArray[0] = “0″;
hexArray[1] = “1″;
hexArray[2] = “2″;
hexArray[3] = “3″;
hexArray[4] = “4″;
hexArray[5] = “5″;
hexArray[6] = “6″;
hexArray[7] = “7″;
hexArray[8] = “8″;
hexArray[9] = “9″;
hexArray[10] = “A”;
hexArray[11] = “B”;
hexArray[12] = “C”;
hexArray[13] = “D”;
hexArray[14] = “E”;
hexArray[15] = “F”;

rhexArray = new Array();
rhexArray[0] = “F”;
rhexArray[1] = “E”;
rhexArray[2] = “D”;
rhexArray[3] = “C”;
rhexArray[4] = “B”;
rhexArray[5] = “A”;
rhexArray[6] = “9″;
rhexArray[7] = “8″;
rhexArray[8] = “7″;
rhexArray[9] = “6″;
rhexArray[10] = “5″;
rhexArray[11] = “4″;
rhexArray[12] = “3″;
rhexArray[13] = “2″;
rhexArray[14] = “1″;
rhexArray[15] = “0″;

function d2h(number) { //converts a decimal number to hexadecimal
sixteen = Math.floor(number/16); //value in the 16s position
one = Math.floor(number-(sixteen*16)); //value in the 1s position
sixteen = hexArray[sixteen]; //hex representation of the value in the 16s position
one = hexArray[one]; //hex respresentation of the value in the 1s position
number = sixteen + one; //concatenate string values of hex digits
return number;
}

function h2d(number) { //converts hexadecimal numbers to decimal equivalents
if(number.substring(0,1) == “F”) {
sixteen = 15;
} else if(number.substring(0,1) == “E”) {
sixteen = 14;
} else if(number.substring(0,1) == “D”) {
sixteen = 13;
} else if(number.substring(0,1) == “C”) {
sixteen = 12;
} else if(number.substring(0,1) == “B”) {
sixteen = 11;
} else if(number.substring(0,1) == “A”) {
sixteen = 10;
} else {
sixteen = eval(number.substring(0,1));
}
sixteen = sixteen * 16;
if(number.substring(1,2) == “F”) {
one = 15;
} else if(number.substring(1,2) == “E”) {
one = 14;
} else if(number.substring(1,2) == “D”) {
one = 13;
} else if(number.substring(1,2) == “C”) {
one = 12;
} else if(number.substring(1,2) == “B”) {
one = 11
} else if(number.substring(1,2) == “A”) {
one = 10;
} else {
one = eval(number.substring(1,2));
}
return sixteen + one; //return sum of these decimal numbers
}

function changeFgColor(number) { //this function receives the background’s hexadecimal color code
//as a parameter, and then returns a suitable font color that would
//be visible on that background color
rnumber = “”;
for(i=0; i < = number.length-1; i++) {
temppos = ralpha.indexOf(number.charAt(i));
rnumber = rnumber + rhexArray[temppos];
}
return rnumber;
}

function changeBgColor() { //this function reads in values from the text fields, parses the text
//as a color code, and then changes the background color
if(inputType == "hex") { //if user has changed the hexadecimal field
document.colorform.hextext.value = document.colorform.hextext.value.toUpperCase();
if(document.colorform.hextext.value.substring(0,1) == "#") { //if user placed "#" in front of hex color code
colorCode = document.colorform.hextext.value.substring(1,7);
} else {
colorCode = document.colorform.hextext.value.substring(0,6);
}
document.colorform.redtext.value = h2d(colorCode.substring(0,2)); //converts to red's decimal value
document.colorform.greentext.value = h2d(colorCode.substring(2,4)); //converts to red's decimal value
document.colorform.bluetext.value = h2d(colorCode.substring(4,6)); //converts to red's decimal value
document.bgColor = colorCode; //change background color
document.fgColor = changeFgColor(colorCode); //change font color to something readable
return false; //exit function
}

//if program reaches this point, the color code is to be based on inputted decimal values,
//as opposed to hexadecimal values

//check red's value range
if (eval(document.colorform.redtext.value) > 255 || eval(document.colorform.redtext.value) < 0) {
alert("All values must be and less than or equal to 255 and greater than or equal to 0.");
return false;
}
//check green's value range
if (eval(document.colorform.greentext.value) > 255 || eval(document.colorform.greentext.value) < 0) {
alert("All values must be and less than or equal to 255 and greater than or equal to 0.");
return false;
}
//check blue's value range
if (eval(document.colorform.bluetext.value) > 255 || eval(document.colorform.bluetext.value) < 0) {
alert("All values must be and less than or equal to 255 and greater than or equal to 0.");
return false;
}

red = d2h(eval(document.colorform.redtext.value)); //convert red's decimal value to hex
green = d2h(eval(document.colorform.greentext.value));//convert green's decimal value to hex
blue = d2h(eval(document.colorform.bluetext.value)); //convert blue's decimal value to hex

colorCode = red + green + blue; //create hexadecimal color code
document.bgColor = colorCode; //set background color
document.fgColor = changeFgColor(colorCode); //change font color to something readable
document.colorform.hextext.value = "#" + colorCode; //rewrite hex's text field with new color code
}

function changeInput(type) {
inputType = type; //inputType is to determine whether the user is changing the decimal text fields,
//or the hexadecimal text fields
}

function instruct() { //alerts user with instructions
alert("Enter a Red, Green, or Blue value of 0 to 255 nor enter a 6 digit Hex Color Code using numbers 0-9nand letters A-F then click Change Background.");
}

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