Redirect to another aspx using Javascript in SharePoint list

When one has to Redirect from inbuilt SharePoint aspx page to custom aspx page in any sharepoint list, one has to enter Javascript in the design code as below.
< script language="javascript" type="text/javascript" >
//// To include ID od the item as parameter such as in case of EditForm.aspx////
var ID=querySt('ID');
//// Concate the form name with Parameters ////
var url="UsersEditForm.aspx?ID="+ID;
//// Open the form in same window using '_self' attribute in Javascrpt ////
window.open(url,'_self');
//// Function to find the specified parameter value from the current page to pass to next page ///
function querySt(ji)
{
hu = window.location.search.substring(1);
var result="";
gy = hu.split("&");
for (i=0;i {
ft = gy[i].split("=");
if (ft[0] == ji)
{
result = ft[1];
}
}
return result;
}
any sharepoint list, one has to enter Javascript in the design code as below.
< /script >