function check( img, inp ) {
	var fields = new Array()
	fields['c_1']= 'i_1';
	fields['c_2']= 'i_2';
	fields['c_3']= 'i_3';
	fields['c_4']= 'i_4';
	fields[img] = 0;
	imga = img;
	var img = document.getElementById(img);
	var inpv = document.getElementById(inp)
	if ( img.className == 'checkbox_off') {
		img.className  = 'checkbox_on';
		inpv.value = 1; 
		if( imga != 'c_5' ){
			for( var a in fields ){
				if( fields[a] != '0' ){
					document.getElementById(a).className  = 'checkbox_off';;
					document.getElementById(fields[a]).value = 0;
				}
			}
		}
		
	} else {
		img.className  = 'checkbox_off';
		inpv.value = 0;		
	}

}