Hallo!

alert() ist Dein Freund!

Hier der richtige Code:

function verstecke(Pos)  {  
  
	for (var x = 0; x <= 8; x++) {  
                var DIV_name = "form_" + x  
                var DIV_Style = document.getElementById(DIV_name).style.display  
                	if ( Pos == x ) {  
                		document.getElementById(DIV_name).style.display = "block"  
                		}  
                        else {  
                        	if ( DIV_Style != "none" ) {  
                        		document.getElementById(DIV_name).style.display = "none"  
                        		}  
                        	}  
  
		}  
	}