activateMenu = function(nav) {
    /* currentStyle restricts the Javascript to IE only */
	if (document.all && document.getElementById(nav).currentStyle) {  
        var navroot = document.getElementById(nav);
        
        /* Get all the list items within the menu */
        var lis=navroot.getElementsByTagName("LI");  
        for (i=0; i<lis.length; i++) {
        
           /* If the LI has another menu level */
            if(lis[i].lastChild.tagName=="UL"){
            
                /* assign the function to the LI */
             	lis[i].onmouseover=function() {	
                
                   /* display the inner menu */
                   this.lastChild.style.display="block";
                }
                lis[i].onmouseout=function() {                       
                   this.lastChild.style.display="none";
                }
            }
        }
    }
}
window.onload= function(){
    /* pass the function the id of the top level UL */
    /* remove one, when only using one menu */
   // activateMenu('nav'); 
}

x = parseInt(window.screen.width) / 2 - 200;  // the number 175 is the exact half of the width of the pop-up and so should be changed according to the size of the pop-up
y = parseInt(window.screen.height) / 2 - 150;  // the number 67 is the exact half of the height of the pop-up and so should be changed according to the size of the pop-up


function popUp(URL) {

CW=window.open(URL,'NewWin','toolbar=no,menubar=no,location=no,resizable=no,status=1,width=400,height=300,scrollbars=no')
        // change the figures of width and height above to customize the size of the window to be opened.
CW.moveTo(x,y);
}