function popup(href, width, height){
	var params="directories=no,location=no,resizable=no,scrollbars=no,status=no,toolbar=no,";
	params = params + "width = " + width + ",height = " + height;
	window.open(href,"", params);
	}

function display (zzz){
	if(document.getElementById){
	target = document.getElementById(zzz);
		if(target.style.display == "none" || target.style.display == ""){
			target.style.display = "block";
			}
			else{target.style.display = "none";}
		    }
		}

function open_form(elem, form_prefix)
{
    // clear all text fields  when change query type
    if (elem.id == 'inp5') {
        for (i=6; i<51; i++) {            
           var field = document.getElementById('inp'+i);
           if (field.type=='text') {
              field.value = ''; 
           }
        } 
        for (i=2; i<9; i++) {            
           var field = document.getElementById('p'+i);
           if (field.type=='text') {
              field.value = ''; 
           }
        } 
    }
    
  if (arguments[2]) {
      
     var i = elem.selectedIndex;
     var there =  document.getElementById(form_prefix + '0');
     var back = document.getElementById(form_prefix + '1');
     there.style.display = i==1 ? "none" : "block";
     back.style.display  = i==0 ? "none" : "block";
  }
  else   {
     var visibleDiv = document.getElementById(form_prefix + elem.selectedIndex); 
     for(var i=0; i<elem.options.length; i++)
     {       
         var tempTag = document.getElementById(form_prefix + i);
         if(tempTag)
         	tempTag.style.display = tempTag == visibleDiv ? "block" : "none";
     }
  }    
}