function popupWindow(a,b,c, s){
    eval('ujablak'+s+' = window.open(a,"BBB"+s,"width="+b+",height="+c+",menubar=0,resizable=1,scrollbars=1,status=0,titlebar=0,toolbar=0,left=0,top=0")')
    eval('ujablak'+s+'.moveTo((screen.width-b)/2,(screen.height-c)/2)')
}

/**
* This functions sames worikng like in php
*/
function array_pop(array){
    return array[array.length-1];
}

function explode(str,separator){
    return str.split(separator);
}