//图片按比例缩放
var flag=false;
function DrawImage(ImgD,iwidth,iheight){
    //参数(图片,允许的宽度,允许的高度)
     var image=new Image();
     image.src=ImgD.src;
    if(image.width>0 && image.height>0){
     flag=true;
    if(image.width/image.height>= iwidth/iheight){
        if(image.width>iwidth){  
         ImgD.width=iwidth;
         ImgD.height=(image.height*iwidth)/image.width;
         }else{
         ImgD.width=image.width;  
         ImgD.height=image.height;
         }
         ImgD.alt=image.width+"×"+image.height;
         }
    else{
        if(image.height>iheight){  
         ImgD.height=iheight;
         ImgD.width=(image.width*iheight)/image.height;        
         }else{
         ImgD.width=image.width;  
         ImgD.height=image.height;
         }
         ImgD.alt=image.width+"×"+image.height;
         }
     }
} 

//获得窗口对象
function GetObj(objName){
	if(document.getElementById){
		return eval('document.getElementById("' + objName + '")');
	}else if(document.layers){
		return eval("document.layers['" + objName +"']");
	}else{
		return eval('document.all.' + objName);
	}
}

function htmlcheck(oForm){
    // 遍历表单中每个表单域
    var els = oForm.elements;
    for(var i=0;i<els.length;i++)
    {
		var sType = els[i].type;
	   	switch(sType)
		{
			case "text":
			case "hidden":
			case "password":
			case "file":
			case "textarea": els[i].value=jsHtmlFilter(els[i].value);
//			case "checkbox":
//			case "radio": 
//			case "select-one":
//			case "select-multiple": ;
		}
	}

    return true;
}

function jsHtmlFilter(str)   
{     
	return str.replace(/<[^<>]*>/ig,"")   
}