var alpha ="@ABCDEFGHIJKLMNOPQRSTUVWXYZ:;./abcdefghijklmnopqrstuvwxyz0123456789_-";
var esue="NBJMUP;jogpsnAftv/db";
var mynew="";
var ch="a";
function fswap(inx) {
		mynew="";
		switch(inx) {
			case 1:
				esue="NBJMUP;csblf-ebodfAxfcsvmfs/dpn";
				break;
			
			default:
				esue="NBJMUP;csblf-ebodfAxfcsvmfs/dpn";
				break;
		}
		var lene=esue.length;
		var lena=alpha.length;
		for (i=0;i<lene;i++) {
			ch = esue.charAt(i);
			for (j=1;j<=lena;j++) {
				if (ch==alpha.charAt(j)) {
					mynew = mynew + alpha.charAt(j-1);
				}
			}
		}
		return mynew
	}
<!--- 1 main, --->
<!--- <a href="" onclick="this.href=fswap(1)">ABCD</a> --->