if (location.search.length > 0) { 
launchstring = location.search.substring(1, location.search.length); 
var launchstringArray = launchstring.split("&"); 
for (var i = 0; i <= launchstringArray.length - 1; i++) { 
var left = launchstringArray[i].substring(0, launchstringArray[i].indexOf("=")); 
var right = launchstringArray[i].substring(launchstringArray[i].indexOf("=") + 1, launchstring.length); 
if (isNaN(right)) { 
right = '"' + right + '"'; 
} 
eval("var " + left + " = " + right); 
}
// Default Pic Number
} else {
var myPic = 1;
}
// Number of total Pics 
var totalPics=42;

if (myPic>1){
myPicPrev=(myPic-1);
} else {
myPicPrev=totalPics;
}

if (myPic<totalPics){
myPicNext=(myPic+1);
} else {
myPicNext = 1;
//location.replace("http://www.site.com");
}