Letras coloridas na vertical

Cole esse código:

javascript:var a=document.getElementsByTagName('textarea')[0];a.value=a.value.replace(/|/g," ███ \n ███");void(0);javascript:cor=new Array('olive','red','orange','fuchsia','green','navy','purple','gray');var z=0;txt=document.getElementsByTagName('textarea')[0];txt.value=txt.value.replace(/(.)/gi,"§$1");txt.value=txt.value.replace(/\§ /gi," ");for(y=0;y<txt.value.length;y++){txt.value=txt.value.replace(/\§/,'['+cor[z]+']');z++;if(z==cor.length){z=0}}void(0)