function checkTradeIn(tradeinpmt, flag){
	if (flag == 'yes'){
		tradeinpmt.disabled=false;
	}else{
		tradeinpmt.disabled=true;
		tradeinpmt.value = "";
	}
}

function checkYears(){ 
	var ff=[],years 
	ff.push(['prevAddress','drpPrevAddYear','drpPrevAddMonth']) 
	ff.push(['custDetails','drpExpYear','drpExpMonth']) 
	for(var i=0;i<ff.length;i++){ 
		years = parseInt($(ff[i][1]).value) + parseInt($(ff[i][2]).value)/12 
		if(isNaN(years)){continue;} 
		if(years<3){ 
			$(ff[i][0]).style.visibility='visible'; 
		}else{ 
			$(ff[i][0]).style.visibility= 'hidden'; 
			switch(i){
				case 0:
					$('txtPrevStreetAddress').value=''; 
					$('txtPrevStreetAddress2').value=''; 
					$('txtPrevUnit').value=''; 
					$('txtPrevCity').value=''; 
					$('drpPrevStateCode').value=''; 
					$('txtPrevZip').value=''; 
					$('txtPrevZip4').value=''; 
					break;
				case 1:
					$('prevempName').value=''
					break;
			}
		}
	}
}
addLoadEvent(checkYears);