function showModels(val) {

    while (document.getElementById('model').options.length > 1) {
        document.getElementById('model').options[(document.getElementById('model').options.length - 1)] = null;
    }
    if(val>0){
        var i=0;
        for (var modid in model[val]) { 
            document.getElementById('model').options[i+1]=new Option(model[val][modid][0],model[val][modid][1]); 
            i++;
        }

    }
    document.getElementById('model').selectedIndex=0;
}
function showPhoto() {  
  	document.getElementById('pic'+document.getElementById('hidden').value).style.display='block'; 
  	document.getElementById('hidden').value=parseInt(document.getElementById('hidden').value)+1;
    if(parseInt(document.getElementById('hidden').value)==11) {
        document.getElementById('a-more').style.display='none'; 
    }
}

function signum(len,id,area){
  	alength = area.value.length;
  	if(alength >= len){
  		area.value = area.value.substr(0,len);
  		document.getElementById(id).innerHTML=0;
  	} else {
  		document.getElementById(id).innerHTML=(len-alength);
  	}
}
function checkVal(f){
    if(f.value=='') {
        f.style.background="#f7e7e7";
        f.style.border="solid #e39191 1px";
    }
    else {
        f.style.background="#f0f0f0";
        f.style.border="solid #ccc 1px";
    } 

}