function set_value(obj,tform,val,change_word){ 
    if( document.forms[tform].elements[obj].value == change_word )
    	document.forms[tform].elements[obj].value = val;
}
function show_hide(elmnt){
    if( document.getElementById(elmnt).style.visibility=="hidden" ){
	    document.getElementById(elmnt).style.visibility="visible"
	    document.getElementById(elmnt).style.position="relative"
	}
	else{
	    document.getElementById(elmnt).style.visibility="hidden"
	    document.getElementById(elmnt).style.position="absolute"
		document.getElementById(elmnt).style.height="1px"
	}
}
function select_all(mark,tform){ 
    if (mark == 'checked') mark = 'true'; else mark = '';
    for (i = 0; i < document.forms[tform].elements.length; i++){
        document.forms[tform].elements[i].checked = mark;
    }
}