function random() { random.seed = (random.seed * random.a + random.c) % random.m; return random.seed / random.m; } random.m=714025; random.a=4096; random.c=150889; random.seed = (new Date()).getTime()%random.m; function NumToHexString(hexnumber) { // takes a number as sole argument, returns the hex value. Will make // the return value at leats two places long by adding zeroes. // I.e., NumToHexString(10)=="0a". var hexstring=""; var hexchar; var hexones; var i=0; hexnumber=Math.floor(hexnumber); while (hexnumber != 0) { i++; hexones=hexnumber % 16; hexnumber -= hexones; hexnumber /= 16; if (hexones>9) { if (hexones==10) hexchar="a"; if (hexones==11) hexchar="b"; if (hexones==12) hexchar="c"; if (hexones==13) hexchar="d"; if (hexones==14) hexchar="e"; if (hexones==15) hexchar="f"; } else hexchar=hexones; hexstring = hexchar + hexstring; } for (;i<2;i++) { hexstring="0"+hexstring; } return hexstring; } function randomPageColor() { // Writes the "body" tag to a document (opening tag only) // including a random background color, and text and link colors // that should have good contrast against the background color. var bg_red=Math.floor(256*Math.random()); var bg_green=Math.floor(256*Math.random()); var bg_blue=Math.floor(256*Math.random()); var text_color; var vlink_color; var bg_RGB; // Here, decide whether the text colors should be light or dark. // Rudimentary color analaysis at best; does not try to calculate // brightness but estimate it instead. if ((bg_red+bg_blue+bg_green)<300 || bg_red < 40 || bg_green < 40) { text_color="#ffffff"; vlink_color="#cfcfcf"; } else { text_color="#000000"; vlink_color="#303030"; } bg_RGB=NumToHexString(bg_red); bg_RGB+=NumToHexString(bg_green); bg_RGB+=NumToHexString(bg_blue); document.write(''); // In case you want to save the body color for future use return bg_RGB; } var currentRGB = randomPageColor();