// ***
// (c)2002 by WalySoft Sistemas - www.walysoft.com.ar
// ***

function CheckAll( myForm, cCheckBoxNames ) {
	for( i=0; i < myForm.length; i++ ) 
   		if( myForm.elements[i].name.indexOf( cCheckBoxNames ) >= 0 ) 
    			myForm.elements[i].checked = true;
}

function UnCheckAll( myForm, cCheckBoxNames ) {
	for( i=0; i < myForm.length; i++ ) 
   		if( myForm.elements[i].name.indexOf( cCheckBoxNames ) >= 0 ) 
    			myForm.elements[i].checked = false;
}

function InvertChecks( myForm, cCheckBoxNames ) {
	for( i=0; i < myForm.length; i++ ) 
   		if( myForm.elements[i].name.indexOf( cCheckBoxNames ) >= 0 ) 
    			myForm.elements[i].checked = ! myForm.elements[i].checked;
}

function IsChecked( myForm, cCheckBoxNames ) {
	nCount = 0;
	for( i=0; i < myForm.length; i++ ) 
   		if( myForm.elements[i].name.indexOf( cCheckBoxNames ) >= 0 ) 
    			if( myForm.elements[i].checked ) ++nCount;	
	return nCount; 
}